as many as they can fit in
The height of football stadiums varies, depending on how many fans are expected to attend games, the amount of money available for building the stadium, and how wide and long the area is that the stadium needs to fit in. The NFL has no rules regarding stadium heights.
There are hundreds of buildings around the world that can fit 18000 people quite easily. Many sports stadiums or halls hold tens of thousands; most skyscrapers have upwards of 20000 workers in them daily.
Football stadiums (either soccer, American football, or others) have various capacities based on their size, seating, and construction. This can vary widely, from a few thousand, to tens of thousands, up to the largest stadiums which can seat more than 100,000 fans. Modern NFL stadiums seat an average of 70,000 to 80,000 spectators. The largest three stadiums in the world as of 2011 were: May Day Stadium (Pyongyang North Korea) - 150,000 Salt Lake Stadium (Kolkata, India) - 120,000 Michigan Stadium (Ann Arbor, Michigan, USA) - 109, 900
They moved because they wanted more seats to fit in the stadium.
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It can fit 105,000 people
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160,000 people can fit into a Greek Amphitheatre.
181 people can fit in a plane