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

Of course Salvador Dalí lived in a castle...

Stunning Roman aqueduct used for 1900 years and still standing.

A Romanesque tower appears when water levels drop.

One of Europe's largest supercomputers is housed inside of a disused chapel.

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

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

Commonly acknowledged as the only public monument to the Devil himself.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

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

Turntable anonymously received orphans, alms, and groceries.

A landscape decorated with enormous skull sculptures.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

A Spanish town built into the cliffs.

An ancient Egyptian temple in the middle of Madrid, Spain.

Mountain where Jesus was first tempted by the Devil.

Wonderland replication in progress by one persistent man.

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

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

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

Three bridges and one giant canyon make up this fantastic Spanish settlement.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The final resting place for Bermuda's British military, including a man who died of sunstroke.