Colorful sky over the Albion Mountains at City of Rocks National Reserve

City of Rocks National Reserve is one of Southern Idaho's best backcountry adventures. The 14,407-acre Reserve is situated at the south end of the Albion Mountains and features towering granite pinnacles, fins and domes. Pictured here is the colorful sky over the Albion Mountains. National Park Service photo. — at City of Rocks National Reserve.