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

Mysterious Spanish catacombs of unknown origins.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

One of the most important Celtic-Roman archaeological sites in Spain.

A fiery-red region of scooped out land still largely untouched by civilization, tourists or otherwise.

This museum is known as the "Land of the Dinosaurs," but its full-scale dino models are just the start.

"Alleys of Stone" form natural mazes in Spanish natural park.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

This tunnel was built in order to protect the village of Daroca from flash floods during rainy seasons.

The haunting concrete remains of a Nazi pebble crusher can still be found in this small French commune.

An aluminum skeleton brings Chinese mythology to the French shore.

The ruins of a medieval castle linked to the murderous French lord that inspired the famous legend of Bluebeard.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

A landscape decorated with enormous skull sculptures.

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

Abandoned 18th century weapons factory in the Aezkoa Valley.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

Abandoned Nazi train station turned underground astroparticle laboratory.

Hundreds of preserved dinosaur footprints can be found along a hiking trail in this small village.

The deserted remains of a luxury hotel turned hospital ward.

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

Mine shafts and hard pastries await visitors at this massive mountain of salt.