Tourists have been coming to northeastern Minnesota since the 1890s, drawn by the wilderness canoe country, Lake Superior's rugged shoreline and cascading streams, and Duluth's reputation as America's great inland seaport. President Theodore Roosevelt established the Superior National Forest in 1909 in recognition of this natural treasure. Early visitors arrived by steamship and rail, but automobile travel and new roads, especially the Lake Superior International Highway, or North Shore Drive, dedicated in 1925, and the Gunflint Trail, built during the 1920s, opened what came to be called the Arrowhead Region. Civic leaders organized the Arrowhead Association in 1924 to promote recreational opportunities, and the North Shore Drive soon became known as one of the nation's most scenic highways. Americans came in large numbers, and by 1938 an estimated 1,000,000 tourists visited Split Rock Lighthouse; in 1940, the U.S. Coast Guard called it probably the most visited lighthouse in the United States. Numerous resorts were developed during the 1920s, Minnesota acquired scenic North Shore areas for parks at Gooseberry Falls in 1933, Cascade River in 1934, and Temperance River in 1936, and in 1926 the federal government moved to preserve the pristine lakes and forests of the boundary region as a wilderness canoe country. The region remains a favorite destination for travelers from around the world.