CHICAGO - Potter & Potter Auctions on Chicago's Northwest Side looks like any other building in the neighborhood. But as Fox 32’s Dane Placko discovered, take a walk inside, and you'll quickly discover it's holding a treasure trove of some of Chicago's darkest history.

What we know:

"This is a detailed look at the dirty underside of Cook County back during the day. About death in Cook County for a five-year period. It's an unusual archive," said John Binder, a Chicago crime historian.

Binder, who is also a crime writer, shared part of his personal collection that's going on the auction block .

"We are looking at an archive put together over the years by Harry Glos, who was basically the chief investigator for the Cook County Coroner's Office from 1952 to 1957," Binder said.

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