Verona is famous for its Roman amphitheatre, the Arena, completed around 30 AD, which is the third largest in Italy, after Rome's Colosseum and the arena at Capua. It measures 139 meters long and 110 meters wide, and could seat some 25,000 spectators in its 44 tiers of marble seats. The ludi (shows and gladiator games) performed within its walls were so famous that they attracted spectators from far beyond the city. The current two-story façade is actually the internal support for the tiers; only a fragment of the original outer perimeter wall in white and pink limestone from Valpolicella, with three stories remains.The interior is very impressive and is virtually intact, and has remained in use even today for public events, fairs, theatre and open-aired opera during warm summer nights.

from wikipedia