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Colosseum

A view of Rome's ancient Colosseum as seen August 5, 2010. REUTERS/Tony Gentile

Colosseum restoration underway

A long-delayed restoration of the Colosseum's only intact internal passageway has yielded ancient traces of red, black, green and blue frescoes — as well as graffiti

and drawings of phallic symbols — indicating that the arena where

gladiators fought was far more colorful than previously thought.