Just got home from Prague. Maybe the most interesting place that we visited was Strahov Stadium. Depending on what part of Wikipedia you trust, it's the worlds largest or second largest stadium. From what I've been able to gather it was built for so called Spartakiads, a mass gymnastic event held to celebrate the Red Army's "liberation" of Czechoslovakia in 1945.
We happened upon the stadium while visiting my girlfriends sister who lives in one of the buildings that can be seen in the middle of the second photo. Apparently, these buildings where built mainly for the purpose to serve as dressing rooms for the athletes participating in the Spartakiads. I found that hard to believe until I read that the 1960 Spartakiad had 750,000 participating athletes and over 2 million spectators.