An ancient tower built during Roman times as a lookout post still stands to this day.

Teeny tiny hotel on the coast of the Canary Islands.

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

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

Saint Joseph was said to heal the deaf and blind, but it was a much smaller miracle that got him canonized.

The mysterious remains of a martyred teenage saint are venerated inside a small country chapel.

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

The world's most elegant power lines.

A 12th century church completely covered in shells.

Two 2,500-year-old Phoenician boats found on the coast of Spain, giving incredible insight into the ancient maritime traders.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

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

This medieval fortification has weathered the centuries better than any other structure from its era.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

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

The prolific artwork of a self-taught sculptor.

An independent naturist colony amidst 1000-year-old ruins.

Salaguti's live-in museum: a fortress against criticism and consumer art.

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

Haunting monument to the German Jewish philosopher who died while fleeing fascism.

A house covered entirely with shells.

Remote ruins of a 2,400-year-old Iberian settlement.

Fascinating exhibits of prehistoric and ancient artifacts displayed with a uniquely modern touch.

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