This tiny museum kept in a B&B laundry room holds the death mask of notorious bank robber Pretty Boy Floyd.

In an odd geographic anomaly this city borders two different states on opposite sides of town.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

This playground sculpture of an icon from the past is dedicated to the children of the future.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

The remains of this hell for leather wild west town can still be found in the Arizona desert.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Where America's first doomsday cult awaited the end of the world.

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

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

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

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

This Old West eatery along America's Loneliest Road was originally a stop on the Pony Express.

Seller of surplus nuclear research materials.

Recycling meets art in this colorful barricade.

In the middle of a desert subdivision, there is supposedly an impact crater site from Kcymaerxthaereal times.