Lavish royal estate punctuated with heated greenhouses.

The world's tallest boat lift stands as a massive piece of industrial tourism.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

Petting this mysterious iron monkey supposedly brings good luck.

This collection of lurid religious statues tell the tales of a saint who stood down the devil.

Meet the bronze beloved pet to a family of famous peeing statues.

Religious dwelling in a Spanish volcano.

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

England's most notorious suicide spot.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

Ruins of a German Castle on top of a towering stone pillar.

Village situated on a narrow volcanic escarpment.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

A sulfuric hellscape in southern Italy.

The world's most active stratovolcano is almost always erupting.

142 ceramic steps become a mosaic once a year.

Italian cave with exceptional acoustics and an unsavory history.

France's most famous cemetery, with some of its most curious tombs.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

Hiding the longest subterranean river known in the world.