The walls of the iconic dome are hollow and have a secret stairway.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Home to items never before seen by the public.

Parts of the civil rights movement unfolded in this historic eatery, helmed by the "Queen of Creole Cuisine."

The only home of the famous French impressionist painter open to the public is now a museum and bed and breakfast.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

A house of courtship where the Jazz Age's most storied lovers got their start.

Imagine playing a version of Legends of the Hidden Temple, but with a distinctly Southern Gothic flare.

An unassuming store hides relics of its former life as the jazz club that hosted some of the best black performers of the 1920s and '30s.

The palatial McDonald's that inspired Wesley Willis.

A Museum of Holography frozen in 1974.

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

The beloved home to all publications indie, erotic, and punky.

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

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

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

A display of magnificent stained glass windows is the first exhibit of its kind.

Years of archaeology, just chillin' by the water cooler.

This museum celebrating the almighty dollar lets visitors literally stand in the shadow of a million bucks.

This historic hotel invented the chocolate brownie.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

The subtle science of a master molecular gastronomist.

A speakeasy takes on Chicago's drinking culture.

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