The Colosseum has been a symbol of Rome since 80 AD, and today it's the most popular sights of Rome. Some 50 000 spectators once gathered in the amphitheater's seats to watch gladiatorial games and other events. As the second most visited attraction in Italy after Vatican, the Colosseum hosts some 4 million annual visitors, meaning that long lines are nearly inevitable without a skip-the-line tour. Choose from a number or tours suited to any age or interest, such as a Colosseum underground tour that heads beneath the arena floor to explore a network of passages; a small-group guided tour of the third tier or night tour that offers an unique experience and relief from the daytime heat. Consider group tours, self-guided audio tours or private tours to discover the history of the Colosseum.