Basilica of Santa Maria in Trastevere

This great church, one of Rome's four major basilicas, was built by Pope Liberius in A.D. 358 and was rebuilt by Pope Sixtus III from 432 to 440. Its 14th-century campanile is the city's loftiest. Much doctored in the 18th century, the church's facade isn't an accurate reflection of the treasures inside. The basilica is especially noted for the 5th-century Roman mosaics in its nave, as well as for its coffered ceiling, which is said to have been gilded with gold brought from the New World. In the 16th century, Domenico Fontana built a now-restored "Sistine Chapel." In the following century, Flaminio Ponzo designed the Pauline (Borghese) Chapel in the baroque style. The church also contains the tomb of Bernini, Italy's most important baroque sculptor/architect. Ironically, the man who changed the face of Rome with his elaborate fountains is buried in a tomb so simple that it takes a sleuth to track it down (to the right near the altar).