These crevices cut into the mountains collect the island’s main source of precious freshwater.

Legends surround this natural rock formation that looks like a Moorish king wearing a crown.

This 15th-century aqueduct with distinctive pointed arches was used for irrigation in the Vinalopó valley.

The 20th-century church looks like a rustic version of the Sagrada Familia.

This abandoned racetrack looks like it is set to hold competitions in the apocalypse.

A well-restored ancient archaeology site gives a real feel for life during the Roman age.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

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.

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

Go inside to really appreciate this 500-year-old technological masterpiece.

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

Learn the incredible story of how an unassuming spa town was transformed into one of the world’s largest uranium mining sites.

Several of these strange cone-shaped bunkers can still be seen around the former Nazi headquarters.

World's largest barrel containing an inn.

This German "living museum" is maybe a bit too immersive.

A Neolithic burial site erected around 3000 BC.

This fountain of a little boy that spits on passersby at erratic intervals is a town icon.

To the great disappointment of doomsdayers, this codex merely contains records of the Moon and Venus.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

No need to strap in for a "ride" on this walkable roller coaster.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.