San Juan County Colorado (Historic Districts) has 9 places on the National Register of Historic Places including 2 places of National significance and 1 place of Statewide significance. Significant places include Durango-Silverton Narrow-Gauge Railroad, Silverton Historic District and Silverton Historic District (Boundary Increase), Martin Mining Complex and Tobasco Mine and Mill.
Some of the country's most noteable architects helped create the San Juan County places including Gen. William J. Palmer, Tobasco Gold Mining and Milling Co., Arthur Fassbinder and Otto Mears. Prominent architectural styles found in San Juan Country are Late Victorian and Late 19th And Early 20th Century American Movements.