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

Planes, trains, and automobiles have all been sunk as attractions at this Illinois diving spot.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

These abandoned grain silos and tunnels are an urban exploration dream.

Buy a token from the liquor store and you can make this beast spew flames on command.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Elaborate hand-carved wooden clocks two brothers made in their spare time are on display at this handsome little museum.

Eight feet in diameter and more than 24 feet around.

A mysteriously dark cemetery monument fuels stories and legends galore.

The remains of a bustling turn-of-the-century park built to showcase the wonders of electricity.

An old town theater converted into a celebration of the hobo legacy.

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

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

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

On the edge of the Valles Caldera National Preserve, these rock formations create an eerie landscape.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

A scenic ravine with an astounding collection of rock art created by the Indigenous people of the Great Plains.

Mysterious ancient petroglyphs carved on a glacial boulder at the tip of Bainbridge Island.

Each winter this underground cave forms a dazzling ice palace.

The lost ruins of the forgotten ferry lie hidden beneath the silt.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The highest point in Virginia can only be reached by passing through ponies and flowers.