In Chicago, a pizza-enthusiast has opened a museum dedicated to the history of pizza.

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

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

Small and slightly hidden, the American Writers Museum is preserving the legacy of America's finest authors.

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

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

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

The 606 is a decade in the making.

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

A hot dog stand where the heads are just as hot as the dogs.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

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

Cemetery featuring rare glass-fronted columbarium.

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

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

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

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

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.