A mysterious castle built as a monument to lost love.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

One artist's yard is full of shining, whirling kinetic sculptures that look like pure steel psychedelia.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

A house and yard adorned with bizarre concrete sculptures in a Milwaukee suburb.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Ruins of a German Castle on top of a towering stone pillar.

An unassuming Swiss institution houses Europe's largest toy museum.

Its vast collection of wondrous gadgets details the fascinating history of information technology.

The Swiss hilltop housed an early 20th-century vegetarian nudist colony.

Explore the subjective dream of a hotel.

Abbey built on the ruins of Roman catacombs.

An 11th-century fortress home to one of the most influential royal houses in medieval Europe.

See the rare bloom of the "Queen of the Night" cactus at one of the world's largest succulent collections.

For centuries no one knew there were hundreds of bones and precious artwork hidden beneath this Swiss church.

These spooky and unusual stone formations create an underworldly landscape.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

Caves famous for the dragon-slaying saint who lived there.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

Stay at this storybook estate, featuring Sir Henry Hudson Kitson's masterpiece "Gingerbread House."

A bypass decorated with large wooden troll carvings.