One of the world's most complex timepieces.

The ruins of an abandoned cemetery are among the last remnants of the old village of La Boulaye before a wealthy landowner had it relocated.

A war-torn Olympic relic is being overtaken by graffiti and nature.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

Ancient paintings known as the "Sistine Chapel of Cave Art."

See replicas of Europe's most famous cave paintings and even some of the animals that feature in the art.

Nestled in the mountains of Portugal is a tiny village made almost entirely of schist.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

A small Portuguese cottage formed between boulders in the countryside.

Houses are tucked between, on, and underneath giant boulders.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

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

This century-old ruined temple was reborn as "The Church of Skate."

A historic Christian shrine nestled within a spectacular natural cave.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

A unique seaside cave where Aleister Crowley faked his own death.

A submerged village appears when dam levels drop.

Dead weights honor the dead of Portugal's fishing industry.

A landscape decorated with enormous skull sculptures.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.