King Carlos IV laid the first stone during construction of this chapel.

A concrete plant shaped like four giant soldiers commemorates one of the most decisive battles of the Napoleonic Wars.

Despite its grandiose name, this enigmatic first-century void under the town is no cave, and it's possibly not a palace either.

Rare karst landscape eroded from a flat seabed.

This surreal-looking tree pruned more than 1,000 years ago is still producing olives for oil.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

A Spanish town built into the cliffs.

There was a top secret plan during World War II to seal a group of soldiers inside the rock.