One of the oldest and certainly best preserved Cistercian abbeys still in existence.

An image of the legendary saint stands in the shadow of a cathedral she liberated.

The great Danube river starts here.

This deceiving white sand beach gets its brilliant hue from the chemical discharge of a nearby factory.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

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

Liechtenstein's royal family calls this medieval alpine castle home.

According to the legend, this structure was built in a single night with the help of the devil.

Ancient snack bar of the Roman Empire re-opened.

The walls and streets of the ancient city are peppered with penises.

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

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

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

Pompeii's less famous neighbor is still revealing her secrets.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

The relics of one of Jesus' 12 apostles are enshrined in this Italian Basilica.

This fishing contraption sits on top of a series of spindly wooden stilts.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The only museum with its curator—and her pets—buried inside.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

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

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