Tucked away on an empty wooded lot in suburban Oklahoma City lie the remnants of an abandoned circus camp.

Collection of skeletal systems from the "world's leading supplier of osteological specimens."

The surprising home of the iconic Santa Monica Pier Ferris Wheel.

An old spiral fire escape dangles above a public courtyard in Midtown Oklahoma City.

An immersive art experience built by local arts collaborative, Factory Obscura, in the building formerly known as The Womb, a psychedelic arts center founded by the frontman of the Flaming Lips.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

This three-mile concrete levee in Pueblo, Colorado was transformed into the world’s longest painting.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

The 55-pound trichobezoar was removed from the stomach of a cow.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

A seven-story 1920s mausoleum outside Denver houses thousands of remains.

The burial grounds of a secret society includes fences topped with fake Tesla balls.

This little museum has an exhibit devoted to the elusive forest denizens.

This massive redwood tree has a hole in the base big enough to drive through.

Folk art crafted from discarded vegetable crates.

Commonly referred to as the most photographed Victorian home in the United States.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

California's first suspension bridge.

A train tunnel that was made obsolete by the dam it helped create.

Home of what was the largest hydraulic mine in the world, producing gold and the first diamonds in the U.S.

Hidden inside a gift shop that doubles as a museum, this gargantuan yo-yo can only be operated by crane.