The Harvey Company got the concession in 1922 to operate a camp at the bottom of the Grand Canyon. Considering the Phantom Ranch's location, Colter's use of on-site fieldstone and rough-hewn wood was deemed the only practical thing for the permanent buildings that replaced tents. In the following years this innovative work became a de facto model for subsequent National Park Service and Civilian Conservation Corps structures, influencing the look and feel of an entire genre of parkitecture, often called National Park Service Rustic. Her structures at the Grand Canyon set the precedent for using on-site materials and bold, large-scale design elements. For her Bright Angel Lodge on the South Rim, she used a scale model to ensure that the lodge and cabins fit into the landscape. The lodge features a remarkable "geological fireplace" in the History Room, with rocks arranged ceiling to floor in the same order as the geologic strata along the Bright Angel Trail down the canyon wall. A chain-smoking perfectionist, Colter cared about backstory and attractive features. She conceived Hermit's Rest as a sort of folly, as if it had been wired together by a reclusive mountain man. The Hopi House was a market for Native American crafts, made by Hopi artisans on the site, and designed in sandstone to resemble a Hopi pueblo. (Unfortunately, a recent cleaning eliminated the artificial age-effects.) The Watchtower was the product of travel and research, and she cared enough to herself prepare a written manual for guides. The original paintings inside the tower were by Hopi artist Fred Kabotie. She also insisted on her proposed name "Phantom Ranch" (over "Roosevelt Ranch") to capitalize on better mental images. Other works Colter's pioneering masterwork may have been the 1923 El Navajo in Gallup, New Mexico, remarkable for its forward-looking fusion of a Native American-inspired design on the severe Art Deco building by Santa Fe Railway architect A. E. Harrison. Her breakthrough creation incorporated Navajo sand paintings and rugs with hand-carved and hand-painted furniture. The original plans sketched about 100 bedrooms and 15 shared baths, making the structure physically obsolete before it was razed to make way for widening Route 77 in 1957, shortly before Colter's death. (She saw demolitions of a few other projects before she died, causing her to despair, "It's possible to live too long.") Mary Colter herself declared the 1930 La Posada Hotel to be her masterpiece. The sprawling,