A fortress off the West coast of Portugal that dates back to 1502.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

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

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

This massive blockhead sculpture hides an entire library.

A medieval military street hidden beneath a charming French fishing village.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

The world's largest boar is a huge steel titan found at a French rest stop.

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

A towering baroque basilica jutting out of the French countryside.

This "social palace" housing complex created a relatively stable and self-contained worker's society... for a time.

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

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

Memorializing the bravery of one young woman facing the monster of her age.