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

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

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

Village situated on a narrow volcanic escarpment.

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

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

The world's largest wooden structure.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

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

A Spanish forest is filled with mysterious stone carvings.

The morbid items in this small and hidden museum are not for the weak stomached.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

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

Wonderland replication in progress by one persistent man.

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

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

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

Bacteria and algae give the salty water its bubblegum hue.

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

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

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

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.