The Three Mile Gulch Prehistoric Archaeological District is significant for industry and prehistoric archaeology, exploration/settlement, and social history.

The Salt Works Ranch agricultural district encompasses 128 acres and includes the original homestead site settled by Charles L. Hall in 1862.  A wide variety of primarily log and wood frame buildings and structures typical of a successful large-scale ranching operation remain on the site.  Of particular interest is the Second Empire style main house which dates from the early 1870s. 

The agricultural history associated with the EM Ranch extends from 1874 through 1948, encompassing the original homesteading by Hardy Epperson, Aldophus Feringer’s assemblage of the large land holdings, the subsequent extensive sheep raising operations of the Chalmers and Galloway partnership, and the economic decline of the Depression years that culminated in the Ownbey family’s ownership of the property.

Developed by Charles L. Hall, the Colorado Salt Works was the only salt production facility of its kind constructed in Colorado.  Located on a 33-acre site adjacent the Salt Works Ranch agricultural district, the intact wood frame barn and the partially collapsed kettle house, a large two-story L-shaped building, serve as visual reminders of one of Colorado’s earliest industrial enterprises. 

The ranch is closely associated with the history of agriculture in the South Park area of Park County.  The buildings and structures at the ranch represent the variety of agricultural functions and construction techniques from 130 years of cattle, sheep, and hay ranching.  The headquarters buildings typify functional, unadorned wood-frame and log construction techniques using locally available materials of the early 20th century. 

Built in 1879 by Leonard Summer, adjacent his brewery operation, the one-story building is of red sandstone quarried near Red Hill Pass.

Constructed by Leonard Summer in the mid-1870s, the primarily stone two-story building was associated with the Summer Saloon.  Since such local saloon owners usually imported their stock from Denver, the brewery represents a somewhat unusual undertaking in a small mining community. 

Constructed in 1874, the small white painted, board and batten church is an excellent, well preserved example of the Carpenter Gothic style. 

The South Park City Museum is an intact mid-twentieth century outdoor museum interpreting a frontier mining community, significant for its association with Park County tourism, the Rush to the Rockies gold-discovery centennial celebration of 1958, and early historic preservation efforts in Park County. 

Located in Court House Square, this two-story red sandstone building has a raised basement and was constructed in 1874.