See the newly re-opened passageway beneath the Roman Colosseum that was used by emperors

A 2,000-year-old tunnel, known as the Passage of Commodus, once used by Roman emperors to slip into the Colosseum unseen will open to the public this month, offering visitors a rare glimpse of the arena’s imperial backstage. CNN's Ben Wedeman gets a tour of the corridor before it opens to the public, examining the work that's gone into its restoration. 2:16 • Source: CNN