Fun fact: The biggest stadium in the world is in North Korea that has a capacity of over 120k people and the 2nd and 3rd biggest ones are college football stadiums and most likely fit over 100k and the biggest stadium is a futbol stadium or just soccer depending where you are from
There used to be plans before World War 2 where Adolf Hitler actually wanted to push for building a stadium that would have held a capacity of 400,000 people. The name of it was called Deutsches Stadion or “German Stadium” but it never got completed because of the war