Postcard of Old Faithful Inn photographed by Asahel Curtis, 1928. The Old Faithful Inn is a hotel located in Yellowstone National Park with a clear view of the renowned Old Faithful Geyser. The Inn features a multi-story log lobby, flanked by long frame wings containing guest rooms. With its spectacular log and limb lobby and massive (500-ton, 85-foot) stone fireplace, the inn is a prime example of the "Golden Age" of rustic resort architecture, a style which is also known as National Park Service Rustic. It is also unique in that it is one of the few log hotels still standing in the United States. It was the first of the great park lodges of the American west. Initial construction was carried out over the winter of 1903-1904, largely using locally-obtained materials including lodgepole pine and rhyolite stone. When the Old Faithful Inn first opened in the spring of 1904, it boasted electric lights and steam heat. The structure is the largest log hotel in the world; possibly even the largest log building in the world. In 2007 the American Institute of Architects conducted a survey to determine the 150 favorite buildings in America; the Old Faithful Inn ranked 36. The Inn, which was designated a National Historic Landmark in 1987, is itself part of the Old Faithful Historic District.