The Illinois State Mental Health Center in Elgin, Illinois has some really creepy tunnels beneath it. Some friends and I explored them back in high school. This was after the facility abandoned it's "Farm Annex" located a couple of miles away from the main facilities. I guess the patients got to work and interact with nature at this Farm Annex years ago and workers used the tunnels to transport the patients. Some were more than a mile long with no pipes or wires, just dirt and a concrete path. We entered through the abandoned buildings which were full of old beds, desks, books, and a lot of other creepy stuff thrown about the place. We had no money to buy flashlights so we used old T-shits soaked in kerosene as torches. This was pretty dumb considering we continuously choked on the smoke. We found recently used beds and "living areas" that we assumed were use by homeless people. Although we never saw anyone, I guarantee that there were "others" down there. It was pitch black and with our torches we could only see about 15-20 feet ahead of us at anytime, but I'm sure that they could see our light from a distance. We heard noises that made our hearts skip a beat. I consider this little trip one of the stupidest things I've ever done. We wandered for hours without mapping or marking anything. It's amazing that we found our way out. We traveled one tunnel for at least a half-mile to a mile before we turned around without coming to an end or seeing a doorway. I think this was the tunnel to the main facility located on IL RT-31. The "Farm Annex" has since been demolished with other businesses built on the land near McLean and Bowes Rd. I heard the tunnel entrances were cemented over, but I bet that if you tried, you could get in somewhere.