A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

A huge cathedral single-handedly constructed by one eccentric monk.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

A darkly erotic open-air statuary in Catalonia.

A science fiction-inspired apartment building designed by a famous Spanish architect.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

The cardinal directions, set in stone.

This abandoned Slovenian military barracks has become a punky-political art squat.

A hotel and restaurant serving as the mecca of kitsch.

The self-made house sculpture of an outsider artist who named himself "Chief Rolling Thunder."

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

A Bibliophile's Dream.

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

This huge metal monument is slowly being stripped to its concrete skeleton.

A grand Yugoslav memorial to the group of partisans who fought and died resisting western Serbia’s Nazi occupation.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

These warring psychedelic crags commemorate an unsuccessful military operation.