Casper, located near the center of Wyoming, sits in the foothills of the Laramie Mountains, a branch of the Rockies and along the North Platte River. This spot with abundant wildlife and preserved wilderness is a delight for outdoor enthusiasts. Popular activities include hunting, fishing, kayaking and whitewater rafting. Hogadon Ski Area is located just south of the city on Casper Mountain, providing winter fun for skiiers, snowboarders and snowmobilers. Casper was an important stop in frontier days and was a hub for several pioneer trails, including the Oregon Trail. This history is represented at the National Historic Trails Interpretive Center, which is dedicated to the hundreds of thousands of immigrants to the Western Plains. Oil was discovered in the Casper area in the late 19th century at the Salt Creek Oil Field, which brought prosperity to the area, and has helped to grow into one of the most important centers in Wyoming.