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

One of the last functioning antique elevators in Chicago.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

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

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

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

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

Partially submerged Buddha heads freckle Chicago’s neighborhoods.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

Hidden on the 7th floor of a historic building, this Cajun spot features wall-to-wall bottles of hot sauce.

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.

The palatial McDonald's that inspired Wesley Willis.

Huge abstract sculptures of the Puerto Rican Flag.

Illegal drag racing two stories beneath Chicago’s streets.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

This cheerfully-named branch of the Chicago River is the fetid result of years of blood, entrails, and meatpacking waste.

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

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

The final resting place of up to 6,000 Confederate soldiers, the largest mass grave in the Western Hemisphere.

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

This modest post office sits on the site of H.H. Holmes' famous murder castle.