Verona Arena (Amphitheatre) - Verona, Italy
The building itself was built in AD 30 on a site which was then beyond the city walls. The ludi (shows and games) staged there were so famous that spectators came from many other places, often far away, to witness them. The amphitheatre could host more than 30,000 spectators in ancient times.
The round façade of the building was originally composed of white and pink limestone from Valpolicella; but after a major earthquake in 1117, which almost completely destroyed the structure's outer ring, except for the so-called "ala", the stone was quarried for re-use in other buildings.