Castlewood Dam was built to provide irrigation for the agricultural development of Douglas County.  Constructed upon a poor foundation, it became controversial shortly after its construction in 1890.

The 1901 two-story commercial building, along with its 1910 addition served as a social hub of the community. 

The Italianate building was constructed in 1881 for Benjamin Hammer.  One of Castle Rock’s earliest stone houses, the colorful local rhyolite stone was quarried from the Castle Rock district.  The house is embellished with dressed segmental arches with keystones, reflecting the skill of the stonemason.

The 1904 building employs rhyolite, an igneous rock quarried in the Castle Rock area, on its two street-side facades. 

Located in Castle Rock’s Craig and Gould neighborhood, the Samuel Dyer House was built ca. 1875 with historic additions constructed through 1932. The house is an important example of local Queen Anne-style design, which tended to be simpler in design and detail than those found in other communities. 

Completed in 1897, the two-story building includes a round arched entrance, bell cast roof, bracketed eaves, and tower. 

Constructed in 1923 of locally made yellow bricks, this two-story building features unusual multi-colored brickwork patterns enhanced by designs in natural colored slate. 

The 1921 bridge was designed by the city engineer, A.B. McFall, and constructed by local contractors Shields & Kimmell. 

Completed in 1906, the two-story red brick building is the town’s only example of the Renaissance Revival style. 

Constructed in 1936, the building is a particularly well-crafted example of Art Deco-flavored Neo-Classicism.