A researcher estimates more than 35,000 people were buried in the area, and the bones of 10,000 to 12,000 bodies remain there to this day.
"It's almost safe to say that if you dig on Dearborn or State Street you'll find something..."
These are human remains from old burial cites. Reasons for the recent discovery of them include the loss of 19th-century cemetery markers and the failure to care for the sites in the 20th.
The bodies have had a curious past in another way:
The poor quality of the soil meant bodies and caskets were constantly shifting and emerging from the sandy, moist and moving lakeside ground.
Ah, Chicago Gothic.
(thanks to my brother)