AIn 1896, the 25th Infantry US Army Bicycle Corps stationed at Fort Missoula, Montana set out across the country on bicycles, on several obstacle intensive test runs of the iron two-wheeled alternative to horses for transportation. Their greatest trip covered 1,900 miles to St. Louis, Missouri, returning to Missoula by train. Mammoth Hot Springs is a large complex of hot springs on a hill of travertine in Yellowstone NP adjacent to Fort Yellowstone and the Mammoth Hot Springs Historic District. Fort Yellowstone was a US Army fort established in 1891 at Mammoth Hot Springs. Yellowstone was designated in 1872 but the Interior Department was unable to effectively manage the park. Administration was transferred to the War Department in August 1886 and General Philip Sheridan sent a company of cavalry to Mammoth Hot Springs to build a cavalry post. The army originally called the post Camp Sheridan in honor of General Sheridan but the name was changed to Fort Yellowstone in 1891 when construction of the permanent fort commenced. The army administered the park until 1918 when it was transferred to the newly created National Park Service. Photographed by Frank Jay Haynes, 1896.