Berlin is home to the oldest gorilla living in captivity in the world. A hill of war rubble outranks every natural high point in the city at 120.1 metres, and a 1,316-metre stretch of the Berlin Wall is what Berlin calls the longest open-air gallery in the world. With about 3.7 million people inside its limits, it is also the most populous city proper in the European Union.
Every fact below is checked against an official register, a statistics office or the institution itself, and we hedge exactly where our sources hedge. If you are planning a trip around them, start with our guide to things to do in Berlin.
1. The Berlin Wall Killed at Least 140 People
Between 1961 and 1989 at least 140 people were killed or died at the Berlin Wall in connection with the GDR border regime, according to the Berlin Wall Foundation. The qualifier matters: this is a documented floor, not a closed total.
Other counts run higher on wider definitions, and the Checkpoint Charlie Museum has long published a larger tally. The Foundation's figure is the one built from case-by-case biographical research, which is why it is the number we carry.
2. Only 43 Kilometres of the Wall Divided Berlin Itself
The border around West Berlin ran 155 kilometres in total, but only 43.1 kilometres of the Berlin Wall actually stood between West and East Berlin. The rest sealed West Berlin off from the surrounding East German countryside.
That distinction is usually lost in the retelling. For the majority of its length the Wall was not splitting a city down the middle at all; it was drawing a ring around an island of West Berlin marooned inside another country.
3. A Gorilla Born Around 1957 Still Lives at Berlin Zoo
Fatou, a western lowland gorilla, was born around 1957 and is the oldest gorilla living in captivity anywhere in the world. Her exact birth date is unknown, so the zoo marks a designated birthday each April; she turned 69 in April 2026.
She arrived in Berlin in 1959 believed to be about two years old, which is where the estimate comes from. She now keeps her distance from the other gorillas and has an enclosure largely to herself.
4. Berlin Has Three UNESCO World Heritage Sites
Berlin holds three UNESCO World Heritage Sites: Museum Island, the Palaces and Parks of Potsdam and Berlin, and the Berlin Modernism Housing Estates. Few cities carry that many inside one set of boundaries.
They are a deliberately odd trio. One is a museum quarter, one a royal landscape shared with a neighbouring city, and the third a group of ordinary-looking housing blocks listed for how they changed the way people were housed.
5. Berlin's Founding Year Belongs to a Town Called Cölln
Berlin dates its founding to 1237, but the record from that year is not about Berlin at all. It is the first mention of Cölln, the twin town on an island in the Spree. Berlin itself is first mentioned in 1244.
The two settlements faced each other across the water and were separate places for generations. The island Cölln stood on is the one that now carries Museum Island, so the official birthday of Berlin belongs to ground that visitors cross without noticing.
6. Museum Island's Five Museums Took a Century to Build
Museum Island is an ensemble of five separate museums sitting in the middle of the Spree, and it has been a UNESCO World Heritage Site since 1999. The buildings went up over the course of roughly a century rather than as one project.
That slow accumulation is the point of the listing: the island reads as a record of how museum architecture itself changed, each building answering the one before it in a different century's idea of how to show a collection.
7. KaDeWe Draws Up to 50,000 Shoppers a Day
KaDeWe attracts between 40,000 and 50,000 visitors on an ordinary day, and roughly twice that in the run-up to Christmas, figures that still hold as of 2026. That is a footfall closer to a transport hub than a shop.
The crowd concentrates on the upper floors, where the food halls have become a destination in their own right. Plenty of people ride the escalators to the top without any intention of buying anything.
8. The East Side Gallery Runs for 1,316 Metres
The East Side Gallery is a 1,316-metre stretch of the Berlin Wall, and Berlin calls it the longest open-air gallery in the world - a description worth attributing rather than stating flat. It remains the longest surviving run of Wall as of 2026.
It survived because of where it stood, backing onto the Spree in Friedrichshain rather than cutting through a street someone wanted reopened. What was once the eastern side of the death strip is now the side you walk along.
9. 118 Artists From 21 Countries Painted the Wall in 1990
In the spring of 1990, months after the border opened, 118 artists from 21 countries painted the surviving stretch of Wall that became the East Side Gallery. The paintings went up while the political situation was still unresolved.
That timing explains the tone. These are not commemorations made at a safe distance but pictures put on a structure that had been lethal a few months earlier, by people who did not yet know how the story ended.
10. Berlin Zoo Opened on 1 August 1844
The Zoologischer Garten Berlin opened on 1 August 1844 and is the oldest surviving zoo in Germany, a standing it still holds as of 2026. The hedge is deliberate: surviving, not first founded, because earlier German collections did not last.
It was built on royal hunting grounds on the edge of what was then the city, stocked partly from the King's own menagerie. The city has since grown around it, which is why one of Europe's older zoos now sits a few minutes from a mainline station.
11. Berlin Kept Two Zoos Because the City Was Split
East Berlin laid out the Tierpark in 1955 in the park of the Friedrichsfelde manor house, as a counterpart to the Zoological Garden that had ended up out of reach in West Berlin. Reunified Berlin still runs both.
It is one of the division's more benign leftovers. Other duplicated institutions were merged or closed once the city reunified; the two zoos were simply kept, which is why a single city supports a pair of them today.
12. The Tierpark Opened With 130 Different Species
The Tierpark opened under the zoologist Heinrich Dathe with 130 different species, and now spreads across 160 hectares of parkland. It was laid out in grounds designed by a landscape architect rather than on a compact city site.
That inheritance still shapes the visit. Where the western zoo is dense and walkable in an afternoon, the Tierpark is a park you cross, with long stretches of lawn and old trees between the enclosures.
13. A Hill of War Rubble Hides an Unfinished Nazi College
Teufelsberg is a 120-metre rubble hill in the Grunewald, raised between 1950 and 1972 from 26 million cubic metres of war debris and heaped directly over an unfinished Nazi military-technical faculty that proved too solid to demolish.
So the building was buried instead. Berlin's answer to a structure it could not remove was to bury it under the wreckage of the war that produced it, and then plant trees on top.
14. Teufelsberg Is the Highest Point in Berlin
Remeasured in 2013 at 120.1 metres, Teufelsberg is the highest elevation in Berlin - and it is entirely artificial, beating every natural hill the city has, as of 2026. The remeasurement is what settled the ranking.
A listening station sat on the summit through the Cold War, and its ruined radomes still crown the hill. The highest thing you can stand on in Berlin is rubble with a spy post on top.
15. Berlin's U-Bahn Runs 155 Kilometres, Like the Wall
Berlin's U-Bahn connects 175 stations over about 155 kilometres of track as of 2026 - almost exactly the length of the border that once ringed West Berlin. The coincidence is a coincidence, but a striking one.
The network still carries the shape of the division. Some lines ran through the East without stopping for decades, their platforms sealed and unlit, and the map became a single system again once the city reunified.
16. Berlin Had No Central Station Until 2006
Berlin went without a single central railway station for its entire history until Berlin Hauptbahnhof opened in May 2006. Deutsche Bahn calls it Europe's largest crossing station, with tracks running at right angles on two levels.
Before that, arriving in Berlin meant knowing which of several termini your train used. A capital of that size operating for centuries without one central station is a direct consequence of how often the city was split and rebuilt.
17. Berlin's First Electric S-Bahn Ran to Bernau in 1924
On 8 August 1924, six experimental AEG railcars ran from the Stettin suburban station - today's Nordbahnhof - out to Bernau. The operator treats that date as the official birth of the S-Bahn.
The significance was not just electrification. It was the arrival of a turn-up-and-go urban railway with its own trains and its own timetable logic, the template a great many city networks later copied.
18. Napoleon Stole the Brandenburg Gate's Quadriga in 1806
After defeating Prussia in 1806, Napoleon rode through the Brandenburg Gate and took its Quadriga to Paris. The sculpture came back to Berlin in 1814 after his defeat, and has stayed put since.
It set the pattern for the Gate's whole career. Almost every regime that has held Berlin has staged something at it, which is why a piece of eighteenth-century city architecture ended up as the country's political backdrop.
19. Berlin Once Ended at the Brandenburg Gate
A customs wall ringed Berlin between 1737 and 1860, and the Brandenburg Gate, built from 1788 to 1791, was one of its gates. It is the only one of those city gates still standing.
The wall was about taxing goods and catching deserters rather than defence. Standing at the Gate today you are standing on the old edge of the city, with everything to the west of it once outside Berlin proper.
20. KaDeWe Is Continental Europe's Largest Department Store
The Kaufhaus des Westens opened in 1907 and now trades across more than 60,000 square metres, which makes it the largest department store on the European continent and second in Europe only to Harrods in London, as of 2026.
The qualifier is doing real work there. It is not the largest in Europe outright, and the distinction is the sort of thing that gets flattened in retelling until the claim stops being true.
21. The SOS Distress Signal Was Adopted in Berlin in 1906
The first International Radiotelegraph Convention met in Berlin in 1906 and adopted the three-dot, three-dash, three-dot distress call the world now knows as SOS. The conference settled a standard that competing systems had been fighting over.
The letters were chosen because the pattern is unmistakable in Morse, not as an abbreviation - the rescue-the-ship readings came later. A committee meeting in Berlin is why the signal sounds the way it does.
22. Berlin Is the EU's Most Populous City Proper
With about 3.7 million inhabitants inside its city limits at the end of 2025, Berlin is the most populous city proper in the European Union as of 2026. The measure is administrative boundaries, not the wider metropolitan region.
That distinction is why the ranking surprises people: several European urban areas are larger once you count the commuter belt. Berlin wins on the city-limits measure partly because those limits are unusually generous.
23. Berlin's Population Peaked in 1942 and Never Recovered
Berlin's registered population reached its all-time maximum of about 4.48 million in 1942, well above the roughly 3.7 million living in the city as of 2026. The wartime registration is itself regarded as an overcount.
The fall that followed came from bombing, flight, partition and forty years of two half-cities with separate economies. It is one of the few European capitals still measurably smaller than it was in the middle of the last century.
24. Reagan Demanded the Wall Come Down in June 1987
Ronald Reagan stood at the Brandenburg Gate on 12 June 1987, behind panes of bulletproof glass, and called out "Mr. Gorbachev, tear down this wall!" The Wall came down two and a half years later.
The line was nearly cut before delivery, and at the time it read to many listeners as theatre rather than policy. Its reputation was made entirely by what happened afterwards, which is not how speeches are usually judged.
25. Soviet and American Tanks Faced Off 100 Yards Apart
In October 1961, ten Soviet and ten American tanks stood 100 yards apart on either side of Checkpoint Charlie. It was the closest the Cold War came to a shooting war on Berlin's streets.
The trigger was procedural to the point of absurdity: a dispute over whether American officials had to show papers to East German guards. The standoff ended by both sides reversing a tank at a time.
26. The Pergamon Museum Will Not Reopen Until June 2027
The Pergamonmuseum closed completely to visitors in October 2023, part of a renovation that has been running in phases since 2013. As of 2026 it is scheduled to reopen on 4 June 2027.
It was the most-visited building on Museum Island, so its closure reshaped how the whole quarter is used. Anyone planning a visit around its best-known reconstructions should check the date before building a day around it.
27. The Holocaust Memorial Holds 2,711 Concrete Stelae
The Memorial to the Murdered Jews of Europe covers a field beside the Brandenburg Gate with 2,711 concrete stelae, and opened on 10 May 2005, sixty years after the war in Europe ended.
There is no prescribed route and no explanation on the slabs themselves. The ground dips as you walk in, so the blocks rise above head height near the middle and the traffic noise drops away.
28. The Olympiastadion Opened for the 1936 Summer Olympics
Berlin's Olympiastadion was built for the 1936 Summer Olympics, which opened there on 1 August 1936. Since its 2004 renovation it holds 74,475 seats, the highest all-seated capacity in Germany as of 2026.
The stadium was kept rather than erased, and the decision remains contested. It still stages football and athletics inside stonework designed as propaganda, with the history documented on site rather than smoothed over.
29. The Reichstag Dome Is Free to Visit
The glass dome above the German parliament was completed in 1999 and is open to the public free of charge as of 2026, though visitors must register in advance and submit a full list of names.
The design is an argument in glass: the public walks a spiral ramp above the chamber, physically over the politicians rather than outside the building. The requirement to book ahead catches out a lot of visitors.
30. The Reichstag Took Ten Years to Build
The Reichstag building was built from 1884 to 1894 to plans by the architect Paul Wallot, and stood as a burnt-out shell for decades after the 1933 fire before its reconstruction in the 1990s.
Through the Cold War it sat almost against the Wall, in use for little and repaired just enough to keep it standing. The building spent more of its life damaged or sidelined than it has spent as a working parliament.
31. Berlin's Botanic Garden Grows Nearly 20,000 Plant Species
The Botanischer Garten in Dahlem spans about 43 hectares and grows close to 20,000 plant species as of 2026, laid out over a century ago on the idea of putting the whole world into a single garden.
That ambition is still legible in the layout, which walks you through geography rather than alphabetically. The great glasshouse remains the centrepiece, and the site doubles as a working research institution.
32. The Müggelsee Is Berlin's Largest Lake
The Müggelsee in Treptow-Köpenick is the largest lake inside Berlin at 7.4 square kilometres as of 2026. It sits at the south-eastern edge of Berlin, well beyond where visitors tend to think the city stops.
Berliners treat it as coastline. In summer the shore fills with swimmers and small boats, all of it reachable on the same transport ticket that gets you to the Brandenburg Gate.
33. Rivers Run 89 Kilometres Inside the City Limits
The Spree, Dahme and Havel flow a combined 89 kilometres inside Berlin's city limits, and the canals add another 67 kilometres on top of that. It is a great deal of water for an inland capital.
The consequence is a city organised around crossings. Waterways cut through districts that feel entirely urban, and a surprising amount of freight and leisure traffic still moves on them.
34. The Teltow Canal Was Opened by Kaiser Wilhelm II
The Teltow Canal, built between 1900 and 1906 and opened by Wilhelm II, runs 37.83 kilometres linking the Havel near Potsdam to the Dahme at Köpenick. It was cut to let barges bypass the city centre.
That original job still shapes the south of Berlin. The canal drew industry to its banks, and long stretches of it now read as a green corridor threaded between the districts it was dug to serve.
35. Even Berlin Cannot Say How Many Bridges It Has
Berlin's own Senate says the exact number of bridges depends on how you count them, and published totals run anywhere between 920 and 2,100. The range is not sloppiness; it is the honest answer.
The spread comes from definitions. Whether you count footbridges, elevated railway structures, culverts, or the several part-structures hiding under one bridge name changes the total by more than a thousand.
36. The Berlinale Was Founded in 1951 as a Cold War Showcase
The Berlinale was created for the Berlin public in 1951, at the beginning of the Cold War, as a "showcase of the free world". It is now, by its own description, one of the largest public film festivals in the world as of 2026.
The hedge is the festival's own. It was built to be watched by ordinary Berliners rather than only by the industry, and that public character is still what distinguishes it from its rivals.
37. The Berlin Palace Was Demolished in 1950
The Berlin Palace was wrecked in 1945 and demolished by the GDR in 1950. The Humboldt Forum now stands in its rebuilt shell, and opened to the public in July 2021.
Both the demolition and the reconstruction were political decisions rather than structural ones. The same footprint has now carried a royal palace, an East German parliament building and a museum complex inside a single lifetime.
38. The Hohenzollern Crypt Holds 91 Burials
The crypt beneath Berlin Cathedral holds 91 burials spanning the late sixteenth to the early twentieth century, one of the most important dynastic burial sites in Germany. The present cathedral was inaugurated in 1905.
The coffins are not tucked away as an afterthought but fill the basement, and they range from plain caskets to enormous ornamented sarcophagi. Five hundred years of one family's funerals sit under the floor.
39. The TV Tower Went Up in Just Four Years
The Fernsehturm was built in about four years and began operating in October 1969. When sunlight catches its tiled steel sphere the reflection forms a cross, which Berliners promptly nicknamed the Pope's Revenge.
The nickname stuck because it embarrassed an officially atheist state that had built the tower as a showpiece of socialist engineering. No amount of re-tiling ever got rid of the cross.
40. The Holocaust Memorial Covers 19,000 Square Metres
The Holocaust Memorial's stelae stand on a field of about 19,000 square metres, laid out exactly as the New York architect Peter Eisenman designed it. The site occupies prime ground a short walk from the Brandenburg Gate.
Putting a memorial of that size on that land was itself the statement. It is not on the edge of the city or behind a fence but in the middle of the government quarter, unavoidable.
41. Berlin Cathedral Stands 116 Metres Tall
Berlin Cathedral rises 116 metres, with a dome of almost 100 metres crowned by a golden cross that makes it visible from a long way across the city. It is far larger than anything that stood on the site before it.
The scale was the intention. It was built as a Protestant answer to the great domed churches of Catholic Europe, and it is best read as a statement of imperial confidence rather than a parish need.
42. Two Lifts Reach the TV Tower Sphere in 40 Seconds
Two lifts carry visitors up to the sphere of the Fernsehturm in 40 seconds, where an observation platform and a revolving restaurant wait at the top. The ride is short enough that the queue takes far longer.
The view is the flattest argument for how the city is put together: you can see the old border as a line of newer buildings, and the parks read as unbroken green from up there.
43. The Humboldt Forum Rebuilt Three Baroque Façades
The Humboldt Forum sits inside a reconstruction of the Berlin Palace, with Baroque façades rebuilt on its north, south and west sides and a deliberately modern front on the fourth. The mismatch is intentional.
Walk round the building and the argument becomes obvious. Three sides quote a palace that was demolished; the fourth refuses to, and the seam between them is where the whole debate about the project sits.
44. Checkpoint Charlie Was Named After the Letter C
Checkpoint Charlie was simply the third Allied crossing point, and took its name from the letter C in the NATO phonetic alphabet. Alpha and Bravo were the two crossings before it.
The plainness of the name is the point. What became the best-known border post of the Cold War was, on the paperwork, just the third one down a list.
45. A 60-Metre Stretch of Wall Stands on Bernauer Strasse
The Berlin Wall Memorial on Bernauer Strasse keeps a 60-metre section of the border standing as it was the day the Wall fell, complete with its patrol road and inner wall. Almost nowhere else preserves the full depth.
That completeness is what makes it worth the trip out from the centre. The East Side Gallery shows one painted face; Bernauer Strasse shows the whole apparatus that stood behind it.
46. The Pergamon Has Been Open Since 1930
The Pergamonmuseum opened in 1930, and its current rebuild will add a fourth wing, finally letting visitors walk a continuous route through the collections rather than doubling back. The work has been under way in stages since 2013 and continues as of 2026.
The museum was designed around objects too large to move once installed, which is exactly why renovating it is so slow. You cannot simply crate up a building-sized reconstruction and store it.
47. Nearly 16,000 Film Professionals Attend the Berlinale
Nearly 16,000 film industry professionals from 130 countries attended a recent Berlinale, a scale it still holds as of 2026. The festival describes itself as one of the largest public film festivals in the world.
What separates it from the other majors is who else is in the room. Ordinary ticket-holders sit in the same screenings as the trade, which is unusual at a festival of this size.
48. A 1974 Roof Sheltered 26,000 Olympiastadion Seats
A roof added for the 1974 World Cup put 26,000 of the Olympiastadion's seats under cover, decades before the full renovation that reshaped the bowl. It was a partial fix rather than a redesign.
That half-measure is why the later rebuild was so extensive. Covering one section of a stadium designed as a single sweeping oval created an awkwardness that took thirty years and a much bigger budget to resolve.
49. The Müggelsee Is Only 8 Metres Deep
For all its size, the Müggelsee is shallow: just 8 metres at its deepest point. That is the reason it warms up quickly enough to swim in through the summer.
Shallow water also makes it temperamental. The lake can turn choppy fast in a wind, which is why the sailing clubs along its shore treat it with more respect than its gentle appearance suggests.
50. Berlin Itself Was First Mentioned in 1244
The first written mention of Berlin dates to 1244, seven years after the record of Cölln that the city now treats as its founding date. The junior partner, on the documents, was Berlin.
The two towns eventually merged and Berlin's name won out, which is why almost nobody outside the city has heard of Cölln. The place that supplied the official birthday lost the naming rights.
51. Berlin Zoo Is the City's Oldest Public Company
The Zoologischer Garten Berlin has been run as a joint-stock company since its founding, which makes it the oldest public limited company in the city, a status it still holds as of 2026.
It is a genuinely unusual arrangement. Shares in the zoo have changed hands for well over a century, and its legal form has outlasted the empire, two republics, a dictatorship and a partition.
Where to Go Next in Berlin
Facts are a way in, not an itinerary. If these have you planning a trip, our guide to things to do in Berlin turns them into places you can actually stand in front of — the preserved border strip, the museum island, the rubble hill with the listening station on top. For everything beyond the capital, the wider Germany hub covers what else is worth the train fare.
How We Checked These Facts
Every claim on this page rests on at least two independent sources in different categories, one of which is always an official register, a statistics office or the institution itself — among them the Berlin Wall Foundation, the Amt für Statistik Berlin-Brandenburg, the Berlin Senate, the Staatliche Museen zu Berlin, the Bundestag, Deutsche Bahn, the BVG and the city's two zoos. We record the date we read each source, and we hedge exactly where our sources hedge: where a register says "at least" or "one of the oldest", so do we. Where two reputable sources disagree — as they do on how many bridges the city has, and on how much rubble went into Teufelsberg — we say so on the page rather than quietly picking the tidier number.
FAQ: Interesting Facts About Berlin
How old is Berlin?
Berlin dates its founding to 1237, though the record from that year is the first mention of Cölln, its twin town across the Spree. Berlin itself first appears in writing in 1244. The city therefore celebrates a birthday that belongs, strictly speaking, to a settlement nobody now lives in under that name.
How long was the Berlin Wall?
The border around West Berlin ran 155 kilometres in total, but only 43.1 kilometres of it stood between West and East Berlin. The rest sealed West Berlin off from the East German countryside around it. At least 140 people were killed or died at the Wall between 1961 and 1989.
How many UNESCO World Heritage Sites does Berlin have?
Three: Museum Island, the Palaces and Parks of Potsdam and Berlin, and the Berlin Modernism Housing Estates. Museum Island has been inscribed since 1999 and is the one visitors usually see, though the housing estates are the more unexpected listing — ordinary blocks of flats recognised for changing how people were housed.
Is Berlin the largest city in the European Union?
By population inside its own city limits, yes. Berlin had about 3.7 million inhabitants at the end of 2025, which makes it the most populous city proper in the European Union. Several other European urban areas overtake it once you count their wider commuter regions rather than administrative boundaries.
How many bridges does Berlin have?
Nobody can say precisely. Berlin's own Senate states that the exact number depends on how you count them, and published totals run anywhere between 920 and 2,100 depending on whether footbridges, elevated railway structures and part-structures are included. Any single figure quoted elsewhere is a choice, not a count.
What is the highest point in Berlin?
Teufelsberg, a hill in the Grunewald remeasured in 2013 at 120.1 metres. It is entirely artificial, raised between 1950 and 1972 from war rubble, and it outranks every natural high point in the city. An unfinished Nazi military-technical faculty lies buried underneath it.
What is the oldest zoo in Germany?
The Zoologischer Garten Berlin, which opened on 1 August 1844 and is the oldest surviving zoo in the country. Berlin has a second zoo as well: East Berlin laid out the Tierpark in 1955 as a counterpart it could reach, and the reunified city still runs both of them.