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

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

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

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

A Romanesque tower appears when water levels drop.

A charming Spanish village sits atop this natural limestone overpass.

Of course Salvador Dalí lived in a castle...

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Village situated on a narrow volcanic escarpment.

An isolated village literally built into the crevices and rock formations of a mountain.

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

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

A temple to modernity, tucked away amid Barcelona's more well known museums.

An architect transformed this abandoned cement factory into his castle-like workshop.

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

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

A monument to the man who almost killed Hitler.

This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Legends of treasure and spirits flow from this this fairy tale-like oasis.