The heads of two giant mythological water horses honor Scotland's horselord past.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

This enchanting natural park is a magical example of a temperate rainforest in Europe.

A charming Spanish village sits atop this natural limestone overpass.

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

A Spanish town built into the cliffs.

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

A landscape decorated with enormous skull sculptures.

A Spanish forest is filled with mysterious stone carvings.

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

This Funeral Hearse Museum represents the finest in cadaver transportation.

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

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

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

Turntable anonymously received orphans, alms, and groceries.

Bacteria and algae give the salty water its bubblegum hue.

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

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

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.