Park visitors walk through the sunset-colored steam cloud of the Excelsior Geyser Crater in Yellowstone National Park, Monday, May 30, 2005. (Kevin Moloney for the New York Times)

Park visitors walk through the sunset-colored steam cloud of the Excelsior Geyser Crater in Yellowstone National Park, Monday, May 30, 2005. (Kevin Moloney for the New York Times)

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Copyright: (c) Kevin Moloney, 2005
Image Size: 3072x2040 / 524.9KB; national park Yellowstone wildlife landscape environment travel vacation thermal steam geyser fumarole spring volcano volcanic
Contained in galleries: Wyoming

Park visitors walk through the sunset-colored steam cloud of the Excelsior Geyser Crater in Yellowstone National Park, Monday, May 30, 2005. (Kevin Moloney for the New York Times)