This deceivingly ordinary warehouse hides an enormous collection of pop culture treasures.

The world's longest known cave system.

A full-scale replica of a 1774 colonial settlement in Kentucky.

Kentucky's longest operating jail is now a spooky spot to spend the night.

Amazing taxidermy dioramas from the 1960s in a cement building meant to look like an ice cave.

This small museum is kept in a house that was integral to the genesis of Uncle Tom's Cabin.

Beautiful waterfalls grace a canyon visibly torn by a violent tornado.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

One of the few surviving "Wigwam"-themed motels.

An abandoned theme park with a strange and tumultuous past.

Prehistoric animals decorate this popular outdoor park.

An enormous natural sandstone bridge in Kentucky.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

Man-made geyser that rises to the exact height of the Gateway Arch.

A notorious Route 66 eatery once frequented by Al Capone.

You were once able to challenge a chicken to tic-tac-toe at this park, which is now converted into the Aikman Wildlife Adventure.

An abandoned meat mecca now serves as an excellent locale for urban exploration.

Moving, mind-blowing metal sculpture work of an outsider artist.

This national park dedicated to the tallgrass prairie ecosystem still displays its military past.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

The only place in America where anyone who wants can shovel coal aboard an antique train.

An amazing collection of scale model ships.

This lagomorph-obsessed Route 66 emporium is home to a giant jackrabbit that sits in a bunny graveyard.