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A general view of Rome's ancient Colosseum at night August 21, 2010. Tourists will be able to stroll inside the ancient arena during night time every Saturday until the end of October. Picture taken August 21, 2010. REUTERS/Remo Casilli

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.