These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

This abandoned five-star hotel is now a five-star urban exploration destination.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

French commune at the heart of conspiracies.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

This sprawling bookstore spans four floors and has more than a million books in stock.

Books you don’t need in a place you can’t find.

This charming, medieval walled village is Spain's first "book town."

Images of neighbors past and present guard the streets of this charming alpine village.

An ongoing medieval tradition of communal pig husbandry is honored with a handsome granite sculpture.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

An old wool-washing house filled with Fluxus contemporary art.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

People have been living in the cave houses on this Italian hillside since the Neolithic era.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

The city of Halifax still bears the scars of the largest explosion prior to the atomic bomb.

A stunning Catholic cathedral built by a curve-loving communist in Brazil’s newly created capital.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

Spanish religion mixed with local architecture has yielded a network of churches unlike any other.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.