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

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

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

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.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

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

A large circus museum with summer performances.

One of Frank Lloyd Wright's final works was this UFO church.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

A bizarre house filled with an astounding array of collections.

A museum devoted to the victims and the survivors of the most catastrophic fire in American history.

Egyptian Revival obelisks still rise over the old mine shafts.

Strange physical sensations and optical contradictions keep visitors coming back for more.

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

This shallow cave got its name from copious amount of human bones found inside.

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

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

This small piece of railroad history sits behind the parking lot of a chain grocery store.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

One of the few surviving Panama Canal steam shovels stands outside a tiny Colorado mining museum.

The huge collection of paintings of the American West is one of Denver's best-kept secrets.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).