The spaceship-like theater, which is still in use, was one of the most popular exhibits at the 1964 New York World's Fair.

"Iron Age" creatures fill this huckster's rusted metal sculpture garden.

A metal ring in the middle of the road marks the exact spot where the Soviet satellite crash-landed in 1962.

Five acres of divinely inspired folk art.

An off-the-beaten-path place to literally hang beneath Milwaukee's Holton Street Bridge.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

Wisconsin's most celebrated export gets the royal treatment on I-94.

A bizarre house filled with an astounding array of collections.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

These molds for fiberglass statues have formed an eerie, accidental sculpture park.

Life-size animals and furniture made entirely from cardboard fill this odd paper-themed restaurant.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

America's most famous piece of self-built architecture.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Notorious artist squat renovated into legal studios.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Hot springs monkey spa in the middle of Hell's Valley.

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

The fairy tale castle of the "fairy-tale king."

Medicinal spa created with the discharge from a geothermal energy plant.

A walk through the historic city center, under the streets of Seattle.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.