Built under Emperor Vespasian in A.D. 70-72 and completed by his son Titus 10 years later, the Flavian Amphitheatre or the Colosseum is a massive stone arena, which at its peak, could accommodate 80,000 spectators. As in the movie "Gladiator", it has hosted violent and brutal displays of gladiatorial combats and wild animal fights, all just for the delight of crowds. Inauguration lasted one hundred days, and approximately 9,000 animals and 2,000 gladiators were killed during the event. Today, the Colosseum is Rome's most visited sight, which never fails to leave visitors awe-struck. Be sure to also come here at night when it looks even more magical.