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

The world's largest collection of the world's largest objects is in one small Illinois town.

This is not your typical jungle gym.

The first home and studio that belonged to the famous architect.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

To find the "unicorns of the deep" you've got to go downstairs.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

These pretty kitties killed and ate as many as 135 railway workers.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

This historic lavatory leftover features two levels of defecation stations completely without context.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

Rusted and decayed, this former mining site is a portal to the past.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

A plaque on the side of a parking garage marks the burial place of a great Ottawa chief.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

People of the Plum Bayou culture built these enormous mounds over 1,000 years ago.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

A commemoration of over 150 of St. Louis's favorite sons and daughters.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

Famous church recognized for both its unique design and disciplined monks that live according to the Benedictine discipline.

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