Yellowstone National Park

Travertine terraces at Mammoth Hot Springs, Yellowstone National Park in winter

Travertine terraces are formed from thermal water rising through limestone. Heat-loving bacteria and algae add vivid colors to the chalky-white travertine.

Travertine terraces at Mammoth Hot Springs, Yellowstone National Park in winter

Unusual green and pink colors caused by thermophilic microbes

Travertine terraces at Mammoth Hot Springs, Yellowstone National Park in winter

Travertine terraces are formed from thermal water rising through limestone. Heat-loving bacteria and algae add vivid colors to the chalky-white travertine.

Travertine terraces at Mammoth Hot Springs, Yellowstone National Park in winter

Unusual colors in the travertine terraces are caused by thermophilic microbes

Travertine terraces at Mammoth Hot Springs, Yellowstone National Park in winter

Unusual colors in the travertine terraces are caused by thermophilic microbes

Upper travertine terraces at Mammoth Hot Springs, Yellowstone National Park in winter

Upper travertine terraces at Mammoth Hot Springs, Yellowstone National Park in winter

Tree line at sunrise in Yellowstone's Lamar Valley

Moose feeding on willows in Yellowstone's Lamar Valley

Dead trees encased in the deposits from Mammoth Hot Springs

Dead trees encased in the deposits from Mammoth Hot Springs

Snow-covered travertine terraces at Mammoth Hot Springs

Motion blur of the Bobby Socks Trees of Yellowstone in Winter

Motion blur of the Bobby Socks Trees of Yellowstone in Winter