The Romans did not call their amphitheater the Colosseum, instead referring to it as the Flavian Amphitheater after the family responsible for its construction. Its name Colosseum originated from the colossal statue of Nero located next to it. While gladiator fights occurred there, thumbs down meant life and thumbs up meant death, contrary to common belief. After Rome's fall, many of the Colosseum's limestone blocks were robbed and used to build churches like St. Peter's Basilica. Earthquakes now pose the greatest threat to the renowned structure, which has become a symbol of peace instead of its original association with death.