This curious, round temple is the oldest still-standing marble building in Rome.

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

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

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

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

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

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

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The oldest operating pharmacy in the world features 800-year-old recipes.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

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

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

Numerous stone coffins from different centuries, lined up in a sixth century basilica.

A gorgeous example of 13th-century Gothic architecture.

Where layer cakes tower above one’s head and there is never a shortage of icing.

This stately clock was gifted from China's last imperial government to the people of Mexico.

The outside of this theater is decorated with a Diego Rivera mural that explores the history of Mexico.

The F1 Mexican Grand Prix circuit goes right through the middle of this old baseball stadium.

The extremely grey columns of one of Mexico City's most iconic beltways are slowly gaining a bit of color.