The vast, abandoned salt mines that lurk beneath Detroit

Over 1,000 feet beneath the city of Detroit is a 1,500 acre sprawl of tunnels created by salt miners at the turn of the twentieth century. Over at Environmental Graffiti, there's a fascinating story about the rise and fall of Detroit as the great city of salt production. Discovered in the late nineteenth century,… » 5/21/12 7:40am 5/21/12 7:40am