The most famous Roman monument, the largest amphitheater of its time. The building was completed in 80AD by the significant Flavian dynasty, from which the original name of the Flavian Amphitheatre comes from. The name Colosseum is believed to be derived from a colossal statue of Emperor Nero which stood nearby. The arena was mainly used for games to entertain Roman citizens. There were gladiator contests, animal fights, sea battles, and other performances. You could get into the Colosseum through one of the 80 entrances, which were numbered for easier access. The richer and more significant your position was, the closer you could be seated to the arena. Colosseum was originally covered by a retractable roof which was operated by thousand of expert sailors to protect the arena from sun and rain. The arena was equipped by a lift system, which was controlled by slaves and it served to get animals and people on to the stage. Many other buildings nearby were linked to the games, among other training schools for gladiators, armory to store weapons, facilities to treat wounded gladiators.