The maximum security facility was once thought to have "the bloodiest 47 acres in America."

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

An Iowa town celebrates its heritage with the tallest working Dutch windmill in North America.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

A cave 150 feet beneath Kansas City is the perfect climate for growing 10,000 delicate orchids.

Undone by Prohibition, this abandoned brewery-turned-flour mill is now ready for its third act.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

A number of gruesome unsolved murders have turned this simple home into a morbid tourist trap.

One of America's first planned communities is preserved in a state park.

A piece of John the Baptist in the American heartland.

A museum celebrating the Victorian obsession with hair art.

A tiny racehorse graveyard in the middle of a quiet Kansas City suburb.

This abandoned prison castle has become an imposing gallery of graffiti art.

This sacred space and gathering spot for the Wyandot Nation has been the surrounded by controversy and confusion.

This bar named after the world's first mixed cocktail was home to one of New Orleans' most notorious politicians.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

The trials and tribulations of marking Poe's grave.

Largest Roman Catholic church in North America.

A haunting tribute to pioneering photographer Clover Adams.

Outsider art meets paleontology at this roadside reptile repository.

Bizarre Cavern.