Fordyce Bathhouse Hot Springs National Park, Arkansas Photo by Ken Lund / Flickr (use permitted with attribution/share alike).
Hot Springs National Park
At Hot Springs National Park in Arkansas, the National Park Service preserves natural hot springs and the opulent bathhouses erected around them in the early 1900's.
The mineral springs, which bubble out at 143 degrees, were once thought to have the power to alleviate pain, restore youth, and cure diseases such as rheumatism.