• 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

Permitted Nature-related Tour Providers

Natural History Tours
Naturalist's World Dr. James Halfpenny P.O. Box 989 Gardiner MT 59030 (406)848-9458
Sandra Nykerk Photography Ms. Sandra Nykerk P.O. Box 87 Gardiner MT 59030 (406)848-7749

Did You Know?

Seventh Cavalry Ensignia Pin.

Prior to the establishment of the National Park Service, the U.S. Army protected Yellowstone between 1886 and 1918. Fort Yellowstone was established at Mammoth Hot Springs for that purpose.