America's first national park, Yellowstone, was originally nicknamed "Wonderland," and the moniker sticks with good reason. As the historic district and the administrative headquarters of Yellowstone National Park, Mammoth Hot Springs includes Fort Yellowstone and Mammoth Hot Springs Hotel and Cabins. Yellowstone National Park opened in 1872. The park gained traction when the Northern Pacific Railroad and the National Hotel — now Mammoth Hot Springs Hotel and Cabins — arrived in 1883. From 2017 to 2019, the Mammoth Hot Springs Hotel underwent a $30 million renovation centered around maintaining and updating its historic Art Moderne elements.