Conejos County Colorado (Historic Districts) has 5 places on the National Register of Historic Places including 1 place of National significance. Significant places include Denver & Rio Grande Railroad San Juan Extension (Boundary Increase), Denver & Rio Grande Railroad San Juan Extension, Garcia-Espinosa-Garland Ranch Headquarters, St. Joseph's Church.
Some of the country's most noteable architects helped create the Conejos County places including Denver & Rio Grande Railroad, Baldwin Locomotive Works, Eugene Medina, Senno Maestas and Justo Duran. Prominent architectural styles found in Conejos Country are Late 19th And 20th Century Revivals and Late 19th And Early 20th Century American Movements.