Rare karst landscape eroded from a flat seabed.

A charming Spanish village sits atop this natural limestone overpass.

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.

Eerie ruins of an abandoned medieval fishing village crumble atop an unforgiving stretch of earth.

A giant concrete orb in far north Iceland marks the ever-shifting boundary.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

The oldest church in Iceland is one of the few to feature ornate decoration.

This modern monument to pagan belief looks like it was transported straight from ancient times.

Learn about Iceland's hidden folk at this school dedicated to the study of elves.

The Icelandic Sea Monster Museum explores the area's history of aquatic cryptid sightings.

An abandoned resort in North Macedonia is a relic from the Communist Party of Yugoslavia.

A war-torn Olympic relic is being overtaken by graffiti and nature.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

These warring psychedelic crags commemorate an unsuccessful military operation.

Yugoslavia's biggest underground airport lies in ruins.

A former ironworks that was the first UNESCO industrial site.

Walled family complexes in Southern China.

The western-most fortress on the Great Wall of China has gone from a strategic stronghold to a kitschy tourist carnival.

China's beehive-shaped pyramids house the remains of a lost kingdom.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.