The Colosseum could accommodate 50,000 spectators.<br />It's the largest amphitheater built by the Roman empire. It's estimated that the outer wall, which is 189 meters long and 156 meters wide, was originally built using 100,000 cubic meters of travertine stone. Some of this stone was later used in the construction of St Peter's Basilica and other nearby monuments. <strong>Completion date:</strong> 80 AD.
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