The Volkshalle was an enormous building planned by Hitler before the second world war. Here is an excerpt from the article on Wikipedia:
Although the Volkshalle was never built, critics claimed it might have severe architectural problems, such as acoustics that would (depending on the critic) either make it impossible to hear a speaker, or would magnify the speaker’s voice to such a volume that it might cause deafness.
In an interview with James P. O’Donnell, Speer said that, during his time in Spandau Prison, he constantly reviewed such criticisms of his architecture, and eliminated (in his opinion) many of them. One problem, however, remained—Speer speculated that during cold weather, the breathing and perspiration of 180,000 occupants in such a large and high dome might precipitate and fall back down. In short, it was possible that the hall might have its own ‘weather’ and create indoor rain because of its overcapacity. This phenomenon has been observed in other very large buildings that have been constructed in reality, such as the Kennedy Space Center’s Vehicle Assembly Building, and (on a minor scale, with light mist as the precipitation on high humidity days) inside the Goodyear Airdock in Akron, Ohio.