At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

A sculpture serving as an homage to Pope John Paul II.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

Secret refuge and museum of the Duke of Florence.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

A Nesting Doll of Churches.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."