Whether seeking respite, outdoor adventure or historical enlightenment, South Dakota offers a complementary balance of scenic brilliance and cultural heritage that keeps visitors coming back. The Black Hills area in the southwestern part of the state is undoubtedly one of earth's treasures, showcasing unprecedented rock formations and mysterious caverns. Hikers delight in the endless trails at the 71,000-acre (28,732-ha) Custer State Park, inhabited by thousands of roaming bison and wild animals. Giant stone carvings of former United States presidents Washington, Jefferson, Roosevelt and Lincoln greet visitors from the side of the world-famous Mount Rushmore in Keystone. Eastern South Dakota, home to many lakes and three major rivers, is a haven for fisherman, hunters, golfers and skiers alike. Mitchell features the world's only Corn Palace, and De Smet preserves the heritage of Laura Ingalls Wilder of the Little House stories. Sioux Falls is South Dakota's most populated city, boasting many state parks, recreation areas and, of course, the legendary falls.