An avant garde art museum at the University of Chicago.

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

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

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

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

Rifle through images of skyscrapers, Worlds Fairs, and more in the largest public postcard repository in America.

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

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

All of Chicago's wood-paved streets are long gone but two alleys remain.

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

G.V. Black, the Father of Modern Dentistry, keeps an eternal eye on Chicagoan’s teeth from his perch in Lincoln Park.

A monument to the art of slicing people open.

A curious collection of miniatures in a quiet corner of the Chicago Children's Museum.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.