Technology Tunnels Illinois Institute

Explore the tunnels. Old constructions are jammed with ancient air vents, disused entrances and hidden tunnels. A group of buildings is the technology tunnel Illinois Institute. An anonymous person has explored tunnels and post maximum findings on this site. He also managed to get on sealed rooftops and photographed the outcomes. This site has photos, maps, guides, diary entries, explanations, etc. It can be the best site on the Onion Links to explore buildings.

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