Experts first noticed the incline about a year ago and have been monitoring it for the past few months, Rossella Rea, director at the 2,000-year-old monument, said in the Italian daily Corriere della Sera. Rea has asked La Sapienza University and the environmental geology institute IGAG to study the problem and report back in a year.
Tests have begun to observe the effects that traffic on nearby busy roads may have on the monument. Prof Giorgio Monti, from La Sapienza’s construction technology department, said there might be a crack in the base below the amphitheatre. “The slab of concrete on which the Colosseum rests, which is like a 13-metre-thick oval doughnut, may have a fracture inside it,” he told the newspaper.
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http://www.guardian.co.uk/world/2012/jul/30/colosseum-rome-leaning-officials-say?INTCMP=SRCH