Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Thousands of well-dressed mummies below a monastery.

This amazingly preserved Doric temple was abandoned before it was ever completed.

Italian cave with exceptional acoustics and an unsavory history.

This antique thermometer honors the creator of the first universal temperature scale.

These mechanical goats first battled it out in the year 1551, all because of an overcooked deer.

This 13th century Gothic brick castle is the largest in the world by surface area.

Naturally formed rock city in Poland.

This enormous censer uses a pulley system installed over 400 years ago.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

Elaborate tile work in this railway station tells the story of Portugal.

The stunning interior of this Gothic church is covered in ornate gold details.

A collection of old neon signs from all over Poland line a secluded courtyard.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

A statue commemorating a Polish dog who took his role as man's best friend very seriously.

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.

A striped 12th-century basilica sits in the countryside of Sardinia.

Stalactites and stalagmites in a beautifully lit cave.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

An unexpected ghost village lurks on the southeast coast of Tenerife.

This no man's land slicing through the island is strewn with abandoned relics of another time.

Once part of an ancient international harbor, it's now an all-you-can-eat shrimp buffet for flamingos and other water birds.

An ancient necropolis of magnificent tombs.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.