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

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

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

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

The history of funerals and funerary customs.

Urban explorers embraced America's now demolished first suburban mall, south of Chicago.

The palatial McDonald's that inspired Wesley Willis.

A Museum of Holography frozen in 1974.

The sign to a demolished amusement park now stands in front of a local library.

The oldest experimental corn field in America is still creating better ways to grow crops.

A historic and oft-filmed prison stands in a Chicago suburb.

Landmark Chicago building narrowly avoided destruction.

One of the few remaining relics of the meatpacking hub that made Chicago the "hog butcher to the world."

Huge abstract sculptures of the Puerto Rican Flag.

One of the most powerful computers in the world can be visited by anyone who wants to experience more computing than they can handle.

No one knows how many bodies are in this vault in a Chicago public park.

A historic beacon built in the aftermath of the worst maritime disaster on the Great Lakes.

It was originally part of a "terrible lizards" collection at the 1964 New York World’s Fair.

Theater has had many different incarnations but has survived the ravages of time.

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

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

The clothes-washing king doubles as a community center with some unusual features, including an aviary filled with finches.

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

The hometown of Popeye's creator is littered with a growing collection of granite cartoon characters.