Colosseum The Colosseum is built of travertine limestone, tuff (volcanic rock), and brick-faced concrete. The Colosseum could hold an estimated 50,000 to 80,000 spectators at various points in its history having an average audience of some 65,000. It was used for gladiatorial contests. The building ceased to be used for entertainment in the early medieval era. The Colosseum is also depicted on the Italian version of the five-cent euro coin. On 7 July 2007 the Colosseum became one of the Seven Wonders of the Modern World. Each year 6 million tourists visit the Colloseum.
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