The Longmire Historic District in Mount Rainier National Park contains the largest group of structures designed in the National Park Service's rustic style. Designed and sited to blend into their natural setting, these buildings were inspired by frontier buildings of the Pacific Northwest and use local materials including massive logs, glacial boulders, and native plant landscaping. Log framing, rough-lapped wood siding, cedar shake roofs, boulder foundations, and stone chimneys are key elements of this style. Stephen T. Mather, the first director of the National Park Service, called for buildings in places where preserving natural beauty is a primary purpose to be attractive and to appear to belong to their settings. A historic walking tour at Longmire is 1¼ miles round-trip and takes about an hour along sidewalks and roadsides. Along the route are the Nisqually River Suspension Bridge, Community Building, Library, Administration Building, Woodland Trail to Paradise, Museum, Former Gas Station, National Park Inn, General Store, Trail of the Shadows, maintenance area, residential area, and the Nisqually River.