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

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A delightful museum devoted to the history of books.

Medieval village and microminiature museum.

A modernist church in an ancient village.

Giant topiary dog once played a role in a terrorist bomb plot.

A 16th-century Andalusian palace.

Beautiful tiles decorate many of the town's surfaces and stand testimony to its glorious artistic history.

For one day every month Barcelona's Estació de França transforms into a market for model trains.

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

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

The earliest known map to show America, discovered by accident at a Paris bookshop.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

This Funeral Hearse Museum represents the finest in cadaver transportation.

This house's itty bitty size means no humans allowed.

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