Merry Widow Radon Health Mine, Montana

An inactive gold mine which naturally emits radon gas, that has been developed into a healing center, with benches lining the 500 foot long shaft to accomodate visitors. The proprietors tout the cleansing effects of radon, and recommend 40 one hour-long sessions in the mine every year for maximum benefits (40 hours is the maximum exposure recommended by state health officials). Thousands make the pilgrimage to the mine, citing relief from arthritis and other ailments. One of a half-dozen or so similar radon mines in the area.