Mammoth Yellowstone, WY
This surreal location, called Mammoth Hot Springs which is located at the northern most part of Yellowstone National Park (near a little community of Mammoth). The springs are a series of 50 or so springs on a travertine hillside - that come to the surface at about 170°. It is a great place to visit when in Yellowstone, however, for the most park it is difficult to capture a great image to represent these unearthly views.
The shot above is found off a boardwalk path on the southern section of the Upper Terrace. The dead trees in a travertine pool of steaming hot water can make for an appealing image, but needs the right light and water in the pools to make it work. I find this shot is best at sunset or dusk and really only works when the springs are running (which is not always the case).