Here are 29 Interesting Amsterdam facts.
1-5 Amsterdam Facts
1. Willem Arondeus was a Homosexual Dutch anti-Nazi fighter who bombed the Amsterdam Public Records Office to hinder the Nazi identification of Jews. He was arrested & executed. His last words were, “Let it be known that homosexuals are not cowards.” – Source
2. If you die in Amsterdam without any friends or family left to attend your funeral, a poet will write a poem for you and recite it at your funeral. – Source
3. The early modern Olympics used to feature an art competition, with sections dedicated to literature, graphic art, music and more. The Amsterdam Olympic stadium is actually a gold medal winner for architecture. – Source
4. The toilets at Amsterdam’s Schiphol Airport pass the white-glove test. A realistic looking housefly is painted inside the men urinals so that men will aim at the fly and try to wash it down the drain. The fly-in-urinal research found that the etching reduced spillage by 80 percent. – Source
5. Amsterdam tram line number 8 was used to deport Jews during the war. For this reason, the tram line was discontinued in 1942 and the number 8 will never be used as a tram line number again. – Source
6-10 Amsterdam Facts
6. Buildings in Amsterdam lean inwards not due to a trick of the eye or bad architecture, but because it makes it easier to hoist furniture up if the buildings are slightly slanted. – Source
7. Every year between 12,000 and 15,000 bikes are pulled out from the canals of Amsterdam. – Source
8. To deflect flight noises from the Amsterdam Airport, an 80-acre park in the shape of perfectly aligned furrows with high ridges in between (inspired by old farming techniques and Chladni patterns), was built. Finished in October 2013, the park cut the noise level in half almost immediately. – Source
9. Amsterdam is surrounded by a 135 km long ring of fortifications consisting of 42 forts and is a UNESCO World Heritage Site. – Source
10. There is a cat sanctuary in Amsterdam which floats, and you can pet the cats there. – Source
11-15 Amsterdam Facts
11. Houses in Amsterdam have narrow windows because owners wanted to avoid high taxes. Later, taxes were determined based on the width of the house, which is the reason many houses in Amsterdam are so narrow, some of them narrowest in the world. – Source
12. Amsterdam has a Night Mayor, whose role is to promote creative and safe, nightlife. – Source
13. There’s a museum in Amsterdam that houses deformed human embryos and other such abnormalities. – Source
14. To deal with the heavy influx of cars into a city that had no large car parks, the organizers of the 1928 Olympics in Amsterdam marked off certain areas with a blue sign containing a white “P”, in doing so creating the international symbol for parking. – Source
15. 75-year-old twins Louise and Martine Fokkens, believed to be Amsterdam’s oldest prostitutes, claim to have had approximately 355,000 sexual partners between them in a 50 year period. – Source
16-20 Amsterdam Facts

16. Starting in September 2008, adults were planned to be legally allowed to have sex in the evenings in Vondelpark, Amsterdam as long as they cleared their rubbish away afterward. The police later stated they would not tolerate this behavior. – Source
17. On Remembrance Day 2010 in the Netherlands, a man suddenly screamed during the two-minute silence ceremony in Amsterdam. The resulting panic and stampede injured 87 people. – Source
18. In March 2007, a statue was erected outside of Amsterdam to honor and “Respect sex workers all over the world.” – Source
19. Amsterdam pays alcoholics with beer for gathering rubbish. – Source
20. An artist based in Amsterdam has captured and bred her own bacteria to create a visible bacterial map of the body. – Source
21-25 Amsterdam Facts

21. The National Monument on the Dam Square, Amsterdam does not only have urns filled with War Cemetery soil to remember those that died during the WWII but also has an urn to remember those who died during the Indonesian War of Independence. – Source
22. There are around 2400 houseboats in Amsterdam, 750 are in the old 17th-century city center. – Source
23. In order to build the Victoria Hotel in Amsterdam, some houses had to be bought and torn down, two homeowners asked for too much money so they just build the hotel around them. – Source
24. In 2006, the Probo Koala, a Greek waste vessel, attempted to dispose of hydrogen sulfide in Amsterdam, but after being denied access, it disposed of the highly toxic waste in over 14 dump sites in the poor suburbs of Ivory Coast. Many sites were near fields growing food or near water supplies. – Source
25. In Amsterdam, over 200 types of psychoactive mushrooms were banned from sale in 2008, so the shop owners began legally selling truffles, which are byproducts of these same mushrooms and contain the same psychoactive drug. – Source
26-29 Amsterdam Facts

26. In Amsterdam the Latin phrase: Homo sapiens non urinat in ventum stands on the facade of some pillars which means: a wise man does not urinate against the wind. – Source
27. Amsterdam’s Rijksmuseum gives out notebooks and pencils on Saturdays so visitors will put their phones away and experience art by sketching, because “you see more when you draw”. – Source
28. 20 paintings were stolen from the Amsterdam Van Gogh Museum in 1991 and were then recovered 35 minutes later because the robbers got a flat tire. – Source
29. The Amsterdam Stock Exchange is the oldest stock exchange in the world. – Source
Number 24 is inaccurate based on your source. The ship was not denied access to get rid of the waste in Amsterdam. It was told it would cost an additional $250,000 and the company not wanting to pay this instead dumped the waste in the Ivory Coast (with permission of it’s government).