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

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

This is not your typical jungle gym.

Giant granite rocks standing end-to-end like a train of circus elephants.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

Erosion and time have created a naturally-formed water park.

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

Lured here by the promise of tens of thousands in gold, Jesse James started a quintessentially American trend of robbing trains in-motion.

The World's Largest Bull.

Home with Gothic windows featured in a famous painting.

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.

The only freestanding table rock formation east of the Mississippi.

One-layer pyramid in Indiana.

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.

The world's largest anatomically accurate brain sculpture.

Display that gathers the basic elements of the universe in one convenient location.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

Unique tower has outlasted a takeover of the company.

The grave of the iconic Kentucky Fried Chicken mascot features a bust of the man behind the goatee.

An enormous natural sandstone bridge in Kentucky.

Moonbows over Kentucky.

The world's longest known cave system.

These crudely shaped folk giants may be the the second most photographed statues in the U.S.