The Colosseum, originally known as Amphitheatrum Flavium (Italian: Flavian Amphitheater) or simply as Amphitheatrum, located in the center of the city of Rome, is the largest amphitheater in the world. Able to hold an estimated number of spectators between 50,000 and 87,000, it is the most important Roman amphitheater, as well as the most imposing monument of ancient Rome that has come down to us. Inserted in 1980 in the list of World Heritage Sites by UNESCO, together with the entire historic center of Rome, the extraterritorial areas of the Holy See in Italy and the Basilica of San Paolo fuori le mura, in 2007 the complex, the only European monument, it was also included among the New Seven Wonders of the World, following a competition organized by New Open World Corporation (NOWC).