The Colosseum or Coliseum, also known as the Flavian Amphitheatre, is an oval amphitheatre in the centre of the city of Rome, Italy. Built of travertine limestone, tuff, and brick-faced concrete, it was the largest amphitheatre ever built at the time and held 50,000 to 80,000 spectators.
The Arco di Costantino or Arch of Constantine is a triumphal arch in Rome dedicated to the emperor Constantine the Great. The arch was commissioned by the Roman Senate to commemorate Constantine’s victory over Maxentius at the Battle of Milvian Bridge in AD 312