The Emperor's Secret Tunnel into the Colosseum

Five tunnels led into the Colosseum. Four were utilitarian passageways, used to convey gladiators, animals, and equipment in and out of the amphitheater's bustling underworld. But the purpose of the fifth tunnel - elaborately decorated, and built later than the rest - is mysterious. Many scholars believe that it was the emperor's secret entrance. This, however, is just one theory...