A dictator's failed public works project has been reborn as two linked trails through spectacular scenery.

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

The world's first electric battery-powered submarine.

An abandoned airport in the middle of nowhere.

Stormy conditions send jets of seawater bursting through holes in the cliffs.

Translating as "The Jump of the Girlfriend," this stunning waterfall has a tragic legend behind it.

Possibly the oldest masonry dam in all of Europe.

A small house in Tazones, completely covered in shells.

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

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

Originally planted by the ancient Carthaginians, this sprawling palm grove is one of the largest in the world.

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

This 15th century pharmacy displays a beautiful collection of ancient medicine jars.

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

The world's most elegant power lines.

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

This enormous censer uses a pulley system installed over 400 years ago.

The odd cement nubs littering this Spanish square are actually the entrances to a series of buried silos.

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

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.

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

An elaborately decorated house sits on an otherwise quiet street.

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