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

Hidden well off the beaten path in Catalonia is this crumbling medieval castle that is slowly being covered in graffiti.

An ornate tower shows off a local artist's architectural flair.

15,000 year old bison sculptures.

Eccentric sculpture garden brings Basque mythology to life.

Some of the smallest works of art in existence.

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

An elaborately decorated house sits on an otherwise quiet street.

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

A landscape decorated with enormous skull sculptures.

Museum of amazing old toys and automata.

Archaeological site of Iberian people ruins.

Abandoned 18th century weapons factory in the Aezkoa Valley.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

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

Abandoned Nazi train station turned underground astroparticle laboratory.

A series of recreated fortifications mark George Orwell's path through the Spanish Civil War.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

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