This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Moorish signal station on a stratgic rocky outcrop.

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

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

Village situated on a narrow volcanic escarpment.

The final resting place of the great navigator, or maybe his brother.

Cliffside houses provide a spectacular view from their perch above the valley.

A Spanish town built into the cliffs.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

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

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

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

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

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

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

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

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

A beautiful but toxic fountain of mercury.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This semi-secret storybook hedge maze is also the oldest garden in the city.

This amazing mountain temple is topped by one of the tallest sitting Buddha statues in the world.

Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.