Impressive. In Missouri, St. Joe Lead Co. donated land containing its mountains of tailings for a state park. St. Joe's State Park, popular for off-roading, with people riding their ATVs, minibikes, etc. through the tailings from the lead mines, also happens to be part of a Superfund site, but that doesn't dissuade people.

http://maps.google.com/maps?q=%22St.+Joe+state+park%22&h...

http://www.epa.gov/compliance/resources/cases/cleanup/cercla...