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This large midwestern cavern features impressive rock formations and an underground waterfall.

A museum within a museum, devoted to history's most questionable medical devices.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

Half of a waterfall goes into the river while the other half seems to disappear.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

The world's largest carnivore sanctuary is home to over 450 meat-eating rescues.

Abandoned silver mine strewn with wrecked and twisted structures.

When ecosystems collide in the arid Southwest.

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

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

An architect's childhood fantasy treehouse made real.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

A popular rock that acted as a waymarker for American pioneers.

One of the largest collections of wildlife art in the United States, built into the side of a cliff in rural Wyoming.

Creek water that starts here has a 50/50 chance of ending up in the Atlantic or the Pacific.

This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

A miraculous natural phenomenon known as "the spring that breathes."