Perched atop a rock outcrop above a waterfall on the Crystal River, Crystal Mill was constructed in 1893 and used a powerhouse water turbine to generate compressed air for silver miners nearby. When the Sheep Mountain Mine closed in 1917, the mill was shut down. It was then placed on the National Register of Historic Places in 1985.
One of the most photographed sites in Colorado, the mill is located 6 miles east of the small town of Marble and is accessed primarily by four-wheel drive vehicles, although hiking and mountain biking are also possible.