The defensive tower was built centuries ago to warn locals of Berber pirate attacks.

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

This spectacular bridge is part of an abandoned train line that once connected Mallorcan capital to the southeastern coast.

Two large eyes painted anonymously on a mountain overlooking the city pay homage to an old legend.

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

Medieval ruins nestled within a breathtaking swath of Spanish nature.

This magnificent market stands as a poignant symbol of the suffering caused by the Spanish Civil War.

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

This abandoned viewing platform has become a monument to unnecessary government spending.

An uninhabited village that preserves and documents rural architecture and an endangered way of life.

This Roman arena once played host to bloody gladiatorial battles.

Marvel at this massive waterspout fueled by the incoming tide.

The abandoned club hides in the hills of Ibiza.

This architectural oddity is an oasis of green on the outskirts of Valencia.

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

Tour the inside of a massive lava tube formed during a 1949 volcanic eruption.

This historical manor is complete with a magnificent garden.

The deserted remains of a luxury hotel turned hospital ward.

Not far from Madrid, a set of perfectly preserved trenches date back to the Spanish Civil War.

A 12th century church completely covered in shells.

Rumors and legends of secret Nazi activities surround this eerily remote island mansion.

The surviving remnants of a destroyed medieval church now stand in a public park.

This enchanting green space houses a labyrinth lined with toxic plants.

These striking ruins of a castle resemble a ship's stern.