Deer and antelope still play near the Casper KOA. More than 75 percent of the world’s pronghorn antelope live within a 90-mile radius of Wyoming’s second-largest city. In many places, the Plains look unchanged from the days when the Oregon, California, Mormon, Bridger, Bozeman and Pony Express trails converged here along the North Platte River. Trail ruts are still visible. Visit the National Historic Trails Interpretive Center or browse pioneer exhibits at the Fort Casper Museum and Historic Site. KOA is close to Teton International’s fifth-wheel factory - stop by for weekday tours.