A European-style bath house in Chicago.

A Museum of Holography frozen in 1974.

A century-old network of freight tunnels underneath the city's historic business district.

This unassuming city park is home to three different types of Native American mounds.

An exhibit of items from the mental institution where Mary Todd Lincoln lived after her son conspired to have her committed.

Chicago’s incendiary role in the labor movement.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

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

The first and only museum dedicated to stained glass and horology opened outside of Chicago in 2017.

Spanking machines, fake goats, and more devices of humiliation are on display in this museum of fraternal initiation devices.

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.

The world's largest collection of the world's largest objects is in one small Illinois town.

World's second largest particle accelerator, where nature reveals its secrets.

Where old school Polish Chicago and young hipster Chicago live side by side.

Home to a protest movement, a bombing, and a dramatic change in labor history.

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

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

This elaborate Hindu temple is located in a Chicago suburb, but looks like it was transported directly from India.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

Cemetery featuring rare glass-fronted columbarium.

Chicago's North Park Village was once the largest municipal sanatorium in the country.

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

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.