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

A mythical bird etched into the face of a rock doubles as the mascot for a nearby school.

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

This softly rounded mansion was built without corners not to avoid evil spirits, but to make them more comfortable.

An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.

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

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

Take a break from all the boring business of death at this funeral home mini-golf course.

The iconic Chicago sculpture hides a beautiful and easily overlooked plaque on the backside.

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

This historic hotel invented the chocolate brownie.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

This historic train station has been converted to a locomotive themed hotel.

Mile-long cave system near Great Smoky Mountains.

More than five miles of underground passageways.