Enormous lake at the bottom of a unique cave system.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Millions of dollars worth of sculpture decorate this Iowa city center.

This zombie-themed restaurant stands out in the heart of corn country.

A multiversal transit station located right below a highway interchange.

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

This replica small town lets visitors take a stroll through the story of progress in the U.S. via thousands of Americana artifacts.

The home for all things Kool-Aid offers everything except a chance to actually enjoy the drink.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

Less a museum than a bizarre fantasy world created by artists and engineers.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

Wax models of disease and deformity are on display at this German medical museum.

The most visited, and possibly most controversial, museum in Germany.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

It's good luck to be mocked by this monkey.

Tucked away between two 19th-century buildings, this small shop specializes in the macabre.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

Community bookshelf of 25-foot-tall book spines.

This little gem of a museum is a hidden jewel filled with prehistoric treasures.

Four ionic columns from the Treasury Department building ended up in a park in Nebraska.

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

Underneath downtown Lincoln resides a network of caves that was also the city's first brewery.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

An opulent monument built for a duke who donated his entire fortune to the city of Geneva.