Significance: The Skidoo Mine is associated with the operations of the Skidoo Mine Company, Death Valley's most successful gold mine. Although the mill shows structural deterioration, the mill is otherwise a we More
Significance: The road system of Rocky Mountain National Park contains the highest continuous highway in the United States and the highest elevation roads in the National Park Service system. The roads were co More
Significance: The Gold Hill Mill is associated with the operations of Louise Grantham, a mining entrepreneur and owner-operator of the highly successful Warm Springs Talc Mine. In addition to being a well-pres More
Significance: Going-to-the-Sun Road is a 51-mile stretch of scenic mountain road in Glacier National Park. The road is significant as a unique engineering accomplishment of the early twentieth century, in that More