The world's oldest bookshop still in operation.

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

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

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

Houses are tucked between, on, and underneath giant boulders.

A unique seaside cave where Aleister Crowley faked his own death.

The tallest tower in Cáceres's Old Town.

Fragments of human bones are embedded in the walls of this quaint alley.

A strange anthropomorphic stele with a mysterious inscription that has never been deciphered.

The largest medieval water tank on the Iberian Peninsula is preserved beneath the Cáceres Museum.

An old wool-washing house filled with Fluxus contemporary art.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

This species of wild goat stars in witchy legends and frolics among the park's eerie rock formations.

A controversial art piece that harkens back to local folklore.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

"Alleys of Stone" form natural mazes in Spanish natural park.

Walls of stone rise up from sinkholes caused by underwater erosion.

Geological storytelling.

Cliffside houses provide a spectacular view from their perch above the valley.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

The ruins of a bombed medieval village memorialize the destruction of the Spanish Civil War.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

This French "sea of rocks" is packed with stunning rock formations and its own medieval castle.