Rent out a glass igloo to watch the Northern Lights like you live in the future.

This disappearing geyser has been attributed to witchcraft, but really it's all about rainfall.

Mysterious craters may have been home to an ancient cult.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

"There's nothing there," and other lies the KGB told us.

This sublime architectural marvel is a rare example of an expressionist church.

Old Danish castle immortalized in Shakespeare's Hamlet.

Six beautiful wooden giants are hidden around Copenhagen.

Copenhagen's celebrated theme park and gardens.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A flamboyant five-story building in Bulgaria resembles a crawling snail.

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

Bridge that died in war and was resurected.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

Somewhere there is a giant who can no longer poop, but now travelers can stay inside his anus.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Thanks to its heroic service during WWII this Soviet castle has been turned into a monument towered over by a brutalist titan.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.