This stately estate house features a tower covered in a bright, modern mural.

This series of Scottish caves has no clear purpose other than baffling historians.

Folky pharmaceuticals abound in this medicinal reliquary.

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

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

A charming Spanish village sits atop this natural limestone overpass.

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

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

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

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

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

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

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

An isolated village literally built into the crevices and rock formations of a mountain.

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

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.

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

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

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

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

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.

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