A fiery crater has been burning in the Karakum Desert since 1971.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This ruined folly was originally built to honor a failed American state that would have become "Westsylvania."

"The Donut" was built as part of an expensive, ill-fated engineering endeavor.

A large collection of steam engines, organs, and fairground attractions.

All that remains of the fishing-vessel-turned-warship is its weathered hull.

A chaotic collection of coin-operated slot machines designed to delight and disturb in equal measure.

A village on the east coast of England that has almost completely eroded into the North Sea.

Unusual British home built to disguise a water tower.

The scene of the United Kingdom's most famous UFO incident, dubbed the "British Roswell."

Grotto replete with mystical designs laid out in glued shell mosaics.

This oak sculpture at the edge of a small woodland is nine feet tall and shrouded in mystery.

Its walls are adorned with exquisite murals of the natural world, transforming it into an ecologist’s Sistine Chapel.

This abandoned gun tower was built to defend the River Thames from a French naval attack.

Surreal riveted sea forts once protected the Kent shores from German attack.

At this cozy bar tucked down a hidden Galway backroad, Guinness makes the Gaelic come out.

Ancient Bronze Age rampart that was used into the middle ages.

This Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

The ruins of a medieval monastery named after a type of tree.

A stunning Victorian abbey and walled garden on a lakefront.

Oliver Cromwell once seized the land under this house, which included the ruins of a medieval abbey that the owner used to build his stately home.