On forested hills surrounding the nation's capital are the remnants of a complex system of Civil War fortifications. Built by Union forces, these strategic buttresses transformed the young capital into one of the world's most fortified cities.
The bighorn sheep is the mammalian symbol of Colorado Parks and Wildlife and Colorado's official animal. Colorado is home to the largest population of the species anywhere. The animals are five to six feet long with a tail three to six inches in length.