The final resting place of the great navigator, or maybe his brother.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Island wonderland for communist autocrats.

A 16th-century horror show built in a lovely Italian garden.

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

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Italian cave with exceptional acoustics and an unsavory history.

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

Southern Italy's spinning top village.

A dead saint, a deadly poison, and a mysterious holy ooze.

Geometry and mystery come together in an epic show of octagonal masonry.

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

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

Secret refuge and museum of the Duke of Florence.

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

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

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

Does this strange mural depict witches battling beneath a penis tree?