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I used to live a few hours from this in college:
http://eol.jsc.nasa.gov/sseop/EFS/printinfo.pl?PHOTO=ISS013-... "The Berkeley Pit receives groundwater flowing through the surrounding bedrock and acts as a “terminal pit” or sink for these heavy-metal-laden waters, which can be as strong as battery acid". It's in the town of Butte MT. Commonly referred to as "Butt" by some other Montanans. The city was once the wealthiest in the nation but after they rapped the landscape and left it battered and bruised, the money quickly left and all they were left with was a giant toxic sink whole. It's a strange sight.