This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

This unassuming layer of clay boasts an out-of-this-world origin story.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

After retiring, Gary Pendergrass turned his yard into a wonderland of outsider art.

This restaurant serves wood-fired fare served in a natural cave with a live spring.

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.

One of Philadelphia's largest murals resides hidden under this bridge.

The oldest surviving presidential residence in the United States.

A symbol of Texas pride.

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

The "world’s largest honky-tonk" also has its own indoor rodeo arena.

This one-room schoolhouse in rural Arkansas dates to the 1920s, but looks like it could be the 1820s.

This mountaintop refuge rehabilitates tigers, lions, bears, and more from illicit wildlife trade—and offers overnight lodging.

This mill has survived a tumultuous past to still produce flour and cornmeal.

This Wild West attraction is alive with glitching automatons.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

No one knows exactly how deep the world’s deepest geothermal hot spring is.

One of the stops along the fateful journey of the Donner Party.

This museum offers an actual time machine back through Colorado's past.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

In the 1950s, two women saved this grand theater in the Colorado mountains from demolition.

This giant green head remembers one of America's jazz giants.

The iconic remains of the original Academic Hall that burned down in 1892.

The famous greeting card maker owns a collection of paintings by the famed surrealist.