In the 1840s, what is now Lincoln Park, was the location of Chicago City Cemetery. The southernmost portion of the cemetery, where one may now find two large baseball fields (the area in the photo above), was the location of the potter's field section of the cemetery. More than 15,000 people, among them 4,000 Confederate soldiers, were buried here on the marshy land bordering Lake Michigan. Many more, with families that had a few bucks to spend, were laid to rest to the north, in marked graves and tombs.
At some point in the 19th century, there was an attempt to relocate all of the bodies interred at the cemetery. A couple of the tombs still remain. I've heard variously that the relocation was because of city expansion, and because of bodies surfacing in the marshy land, and because of fear of disease and contamination. There was a cholera epidemic with many of the victims buried here, and Lake Michigan was and is our water supply, thankfully filtered these days.
Over the years, human bones keep turning up with alarming frequency, like every time someone does a little digging with a backhoe, so it's presumed that many bodies are still under the park to the north, and beneath the baseball fields. Today, the dog was doing some intense sniffing and mad digging all over the ball fields, which inspired me to shoot this photo and tell the story of the hidden cemetery.