A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

An enormous park-like oasis, full of famous Chicagoans’ graves.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

Cemetery featuring rare glass-fronted columbarium.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A downtown park built on top of unclaimed graves.

While comics are the main attraction at this megastore, the second floor plays host to an exhibit fit for a museum.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A small town built on an abandoned airfield has former runways as streets and a bar and grill in an old airplane hangar.

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

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

Locally known as the "Onion” and the "Egg Beater,” Casper’s most recognizable buildings are beloved local landmarks to many, and eyesores to others.

This popular bar has been blurring the line between normal and edgy for more than 75 years.

A museum dedicated to the history and exploration of both popular music and science fiction.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

This is not your typical jungle gym.

One of few surviving standpipe water towers in the U.S.

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