A small house in Tazones, completely covered in shells.

Remnants of the rich history of fish salting in this ancient Mediterranean port town.

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

A historic Christian shrine nestled within a spectacular natural cave.

This 19th-century fountain's namesake animal isn't what you think it is.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

Long tunnels run under the ancient chariot racing circuit to the tower.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

The largest prehistoric cemetery on the Balearic Islands dates back over 2,500 years.

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

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

This enchanting hamlet carved into the rock looks like something straight out of Tolkien's Rivendell.

This embalmed man is one of the best preserved mummies from the Canary Islands.

Hundreds of caves once used to store grains and animal feed.

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

The deserted remains of a luxury hotel turned hospital ward.

Abandoned 18th century weapons factory in the Aezkoa Valley.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

A whimsical garden of outsider art in the Spanish countryside.

This amended headstone marks the grave of a participant in one of the most successful military deceptions of all time.

A modernist church in an ancient village.

An outsider folly near Madrid.