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

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

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

This historic hotel invented the chocolate brownie.

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

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

The largest outdoor art gallery in the Northwest United States.

Home to the deepest rift anywhere on Earth.

A museum and doll store featuring a surreal and super sanitized version of where babies come from.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

This replica of the Greek structure is in the heart of Nashville.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

The largest freshwater lake in the Florida Keys.

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

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

This oversize piece of novelty cookware once cooked the largest pancake in the world.