Individually listed structures on the National Register include the Longmire Buildings, a National Historic Landmark comprising the park's former headquarters, the Longmire Cabin, and three comfort stations, L-302, L-303 and L-304. The district was placed on the National Register of Historic Places on March 13, 1991. Longmire is also the location of Mount Rainier's National Park Inn, the Longmire Museum. These buildings are constructed in rustic style. The National Park Inn is the only accommodation in the park open all year round. The Longmire Historic District is in turn part of the Mount Rainier National Historic Landmark District, which encompasses the entire park and which recognizes the park's inventory of Park Service-designed rustic architecture.