Part of the inside of the Colosseum

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Although partially destroyed, the Colosseum is still enormous, one of the largest Ancient Roman ruins. In A.D. 70, the emperor Vespasian began construction of the 45-50,000 seat stadium (that's larger than some baseball stadiums of today!). The building was completed in A.D. 75 and inagurated by Vespasian's son Titus. It was used for shows, mostly gladiatorial combats and wild beast hunts.