View from the Beartooth Highway, Wyoming.

Mammoth Hot Springs Terrace, Yellowstone National Park, Wyoming.

Midway Geyser Basin, Grand Prismatic Spring, Yellowstone National Park, Wyoming.

Teton Range and String Lake at sunrise, Grand Teton National Park, Wyoming.

Teton Range and String Lake at sunrise, Grand Teton National Park, Wyoming.

Orange Spring Mound, Mammoth Hot Springs Terrace, Yellowstone National Park, Wyoming.

Tent, Devil's Tower National Monument and star trails, Wyoming.

Midway Geyser Basin, Grand Prismatic Spring, Yellowstone National Park, Wyoming.

Midway Geyser Basin, Grand Prismatic Spring, Yellowstone National Park, Wyoming.

Teton Range and String Lake at sunrise, Grand Teton National Park, Wyoming.

Mount Moran from Oxbow Bend at dawn, Grand Teton National Park, Wyoming.

Devil's Tower National Monument, Wyoming.

Tent and Devil's Tower National Monument, Wyoming.

Teton Peaks from motorcycle on Teton Park Road, Grand Teton National Park, Wyoming.

Conifer forest, Devil's Tower National Monument, Wyoming.

View from the Beartooth Highway, Wyoming.

Mammoth Hot Springs Terrace, Yellowstone National Park, Wyoming.

Orange Spring Mound, Mammoth Hot Springs Terrace, Yellowstone National Park, Wyoming.

Teton Range and Jackson Lake at sunset, Grand Teton National Park, Wyoming.

Angel Terrace, Mammoth Hot Springs Terrace, Yellowstone National Park, Wyoming.

Angel Terrace, Mammoth Hot Springs Terrace, Yellowstone National Park, Wyoming.

Tent and Devil's Tower National Monument, Wyoming.

Old Faithful Geyser, Yellowstone National Park, Wyoming.

View from the Beartooth Highway, Wyoming.

Fumaroles, Yellowstone National Park, Wyoming.

Tent and milky way visible in the sky over Teton Range, Grand Teton National Park, Wyoming.

Tent and Teton Range at dusk, Grand Teton National Park, Wyoming.

Angel Terrace, Mammoth Hot Springs Terrace, Yellowstone National Park, Wyoming.

Taggart Lake and Grand Teton, Grand Teton National Park, Wyoming.

Grand Canyon and Lower Yellowstone Falls, Yellowstone National Park, Wyoming

Teton Park Road and Teton Range at sunrise, Grand Teton National Park, Wyoming.

Teton Range and String Lake at sunrise, Grand Teton National Park, Wyoming.

Tower Fall, Yellowstone National Park, Wyoming, Wyoming.

Midway Geyser Basin, Grand Prismatic Spring, Yellowstone National Park, Wyoming.

Devil's Tower National Monument, Wyoming.

Teton Park Road and Teton Range at sunrise, Grand Teton National Park, Wyoming.

Old Faithful Geyser, Yellowstone National Park, Wyoming.

Sky and Teton Range at dusk, Grand Teton National Park, Wyoming.

Midway Geyser Basin, Grand Prismatic Spring, Yellowstone National Park, Wyoming.

Fumaroles, Yellowstone National Park, Wyoming.

View from the Beartooth Highway, Wyoming.

Orange Spring Mound, Mammoth Hot Springs Terrace, Yellowstone National Park, Wyoming.

Orange Spring Mound, Mammoth Hot Springs Terrace, Yellowstone National Park, Wyoming.

Devil's Tower National Monument, Wyoming.

Orange Spring Mound, Mammoth Hot Springs Terrace, Yellowstone National Park, Wyoming.

Midway Geyser Basin, Grand Prismatic Spring, Yellowstone National Park, Wyoming.