Mammoth Hot Springs is a large complex of hot springs on a hill of travertine in Yellowstone National Park adjacent to Fort Yellowstone and the Mammoth Hot Springs Historic District. It was created over thousands of years as hot water from the spring cooled and deposited calcium carbonate.
Mammoth Hot Springs
Mammoth Hot Springs Hotel & Cabins
Albright Visitor Center
Fort Yellowstone
Mammoth Dining Room
Mammoth Terrace Grill