The Mother of All Stadiums
The Colosseum is one of the Seven Wonders of the World. Like Yankee Stadium, it was built to accommodate more than 50,000 spectators; unlike Yankee Stadium, it also was designed so that those spectators all could exit in three minutes flat. It had a sunroof that could be pulled across for shade and was designed to be water tight, so that water battles could be staged. Historians estimate that while it was in use, more than 500,000 gladiators and more than 1,000,000 animals died here.