The area is now just a pile of rubble. It went through several stages of expansion over the centuries and at its peak it could hold about 50,000 spectators who sat on the sloping ground around the stadium.
The Ancient Stadium of Olympia had seating made of mud for about 20,000 spectators as well as a special seating area for spectators. Sitting was allowed, though many onlookers stood to get a better view or to cheer for contestants.
The Emirates Stadium, home of Arsenal Football Club, is not the 2nd largest stadium in the world. There are many stadiums in the world much bigger than it and there are stadiums in England that are bigger than it.
The Ancient greek theatre could hold just about 20,000 spectators. It also had 32 rows of seats. The upper diazoma had another 32 rows of seats. Later on the theatre got increased by 72 rows. With 67 officials' thrones in the first row, which were built of white Pentelic marble.