People line up outside this ancient church with a Romanesque bell tower not for great art treasures, but to see the “Mouth of Truth,” a large disk on the wall of the portico. As Gregory Peck demonstrated to Audrey Hepburn in the film Roman Holiday, the mouth is supposed to chomp down on the hands of liars. It may have been an ancient drain cover, though one hypothesis says it was a so-called “talking statue,” where anonymous notes were left to betray wrongdoers. Our take? Save this hokey photo op until you’ve seen everything else you want to see in Rome.