The scene of the United Kingdom's most famous UFO incident, dubbed the "British Roswell."

This towering totem holds the title for the tallest in the world but only according to some.

This remote location of this Moorish stronghold means it doesn’t attract many tourists—and that it still has the aura of fear and bravery of the 1300s.

This centuries-old tower hosts endangered bald ibis mating pairs and looms over a pristine beach.

A reservation-only highland forest reserve of endangered Pinsapar firs stands above a village in Andalucía.

An otherworldly art experience.

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

The walls of these four caverns are filled with art that dates back to the earliest human presence in Europe.

These primitive rock paintings include a very beloved depiction of a woolly mammoth.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

This surreal-looking tree pruned more than 1,000 years ago is still producing olives for oil.

Rare karst landscape eroded from a flat seabed.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

A Spanish town built into the cliffs.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

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

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

A complimentary beverage is offered to the bodega's resident rodents every day.

The world's most elegant power lines.

Moorish signal station on a stratgic rocky outcrop.