Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

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

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

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

Of course Salvador Dalí lived in a castle...

A series of recreated fortifications mark George Orwell's path through the Spanish Civil War.

The world's largest wooden structure.

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.

A completely underwater art museum sends a stark message about humans' impact on the environment.

Stunning Roman aqueduct used for 1900 years and still standing.

Abandoned Nazi train station turned underground astroparticle laboratory.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

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

This Funeral Hearse Museum represents the finest in cadaver transportation.

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

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

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

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

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

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

A Spanish forest is filled with mysterious stone carvings.

A stately palace has been converted into the world's largest cannabis museum.