Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

These markers are used to determine the ground stability of the Strip.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

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

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

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

A concrete block embedded with thousands of pulled teeth was created by a local dentist to memorialize his dog.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

The world's longest known cave system.

The first artificial white water river course in North America cuts right through an Indiana city.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

There's more contention than one might expect from cherry pie pans.

Taxidermy and miniatures come together to create this unique museum.

Watch the ships come in on Michigan's 210 ft. high observation deck in Sault Ste. Marie.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

In the main dining room, a nine-ton boulder caps the fireplace designed by local architect Earl Young.

Unique Michigan homes look like something out of Tolkien's "The Lord of the Rings."

The evolution of recreational vehicles and motorhomes is on display in the “RV capital of the world."

One of the world’s largest living advertisements is made out of pine trees.

The longest structure of its kind ever built in Michigan.