111 places in Rome that you must not miss

20 million tourists are drawn to Rome--every year. They admire the Colosseum and St. Peter's Cathedral, sit down on the Spanish Staircase, and stroll along the Campo de Fiori. But the Eternal City offers still more: secrets, clandestine spots, stories sunk into oblivion. Why, for example, is there a lighthouse, although Rome is not on the ocean? Where is the grave of Pope Joan? What does the hangman's cloak have to tell? What landmark was nearly...