• Visitors stand on the boardwalk of Grand Prismatic, the park's largest hot spring which is ringed with orange, brown and yellow runoff channels.

    Yellowstone

    National Park ID,MT,WY

Places

Hymen Terrace, Mammoth Hot Springs, with Fort Yellowstone in the background.
Hymen Terrace, Mammoth Hot Springs, in the foreground with historic Fort Yellowstone in the background.
Detroit Photographic Co circa 1902
 
Early after Yellowstone Park was established, the U.S. military assisted in protecting and administering the park. Visit these pages to learn more about historic Fort Yellowstone, and the historic back-country cabins they constructed.

Did You Know?

Lake Trout Illustration

Lake trout are an invasive species of fish that is decimating the native cutthroat trout population in Yellowstone Lake.