Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Ancient ruins hidden underneath a modern luxury hotel.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

The “Sistine Chapel” of the Middle Ages merges 11th-century science and religion in wondrous hues.

This splendid mosaic embodies ancient Rome's fascination with the exotic allure of Egypt.

A medieval fountain lined with 99 unique stone faces whose origins and meaning remain unknown.

This medieval oratory decorated in magnificent frescos was constructed after Charlemagne received a vision.

Host to the annual Festival of the Snakes.

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

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Romans built the world's tallest artificial waterfall in 271 BC.

Naturally preserved bodies are eerily staged throughout the crypt in varying poses.

This 16th-century monastery has been turned into a surrealist architecture compound.

A dreamlike medieval church dug into the tuff rock, with unusual carvings and possible traces of the Templar knights.

This network of roads is one of the most unique Etruscan creations ever discovered.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

Strange rumors surround the artist who created these solemn metal guard dogs.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

This stunning mountain lake was named for a pair of tragic lovers whose statues stand at the center.

The Emperor Tiberius' palace of debauchery.

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.

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

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