San Simeon is a town and census-designated place on the Pacific coast of San Luis Obispo County, California. Its position along State Route 1 is about halfway between Los Angeles and San Francisco, each of those cities being roughly 230 mi (370 km) away. A key feature of the area is Hearst Castle, a hilltop mansion built by William Randolph Hearst in the early 20th century that is now a tourist attraction. The area is also home to a large northern elephant seal rookery, known as the Piedras Blancas rookery. It is located 7 mi north of San Simeon on Highway 1.