Mammoth Hot Springs Historic District
It is composed of two major parts: Fort Yellowstone, the military administrative center between 1886 and 1918, and now a National Historic Landmark, and a concessions district which provides food, shopping, services, and lodging for park visitors and employees.It was added to the National Register of Historic Places on March 20, 2002, for its significance in architecture, conservation, entertainment/recreation, and military.[2] Fort Yellowstone is a carefully ordered district of substantial buildings that clearly indicate their military origins.The Horace Albright Visitor Center is located in the old bachelors' officers quarters (constructed in 1909).[5] The district is directly adjacent to the Mammoth Hot Springs thermal area, and is itself built on an ancient travertine terrace.