An artsy hidden staircase leads to breathtaking views of San Francisco.

A battle between nature and architecture in the Cambodian jungle.

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

Dramatic river bend surrounds a natural red-rocked pedestal.

A museum dedicated to exhibiting remarkable outsider art.

Macabre astrological automaton clock dating to the late 1400s.

An emerald-green grotto just a short trip from Austin.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

Opulent downtown movie theater now houses cars as an indoor parking garage.

A Beaux-Arts triumph set to become Ford's innovation campus

This fantastical waterfall is hidden in a cave located in a cracked cliff.

An encyclopedic collection of mammal penises.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

"We Seceded Where Others Failed."

A house filled to the brim with oddities and curiosities.

A wall of chewing gum moonlights as collective art.

From a neon Rapunzel to a bike traffic meter to a street fair color scheme, the most opened drawbridge in the US is a veritable art gallery.

A giant Troll lurks under one of Seattle's oldest bridges.

An abandoned relic of the city's failed experiment with below ground transit.

A castle built by an eccentric medieval enthusiast in rural Ohio.

A super-sized promotional trick that is now a D.C. landmark.