Pearl Harbor is located on the island of Oahu, which is often called "The Gathering Place" and is the most populated island in the state of Hawaii. Specifically, it is situated on the south shore of the island, just west of the state capital, Honolulu. The harbor is a natural lagoon and serves as a major base for the United States Navy and the headquarters of the U.S. Pacific Fleet. The site is a National Historic Landmark and is home to several significant memorials, including the USS Arizona Memorial, the USS Bowfin Submarine, and the Battleship Missouri Memorial. Because of its central location on Oahu, Pearl Harbor is easily accessible via public bus or car from the tourist hub of Waikiki. Visitors often spend a full day exploring the various sites that commemorate the events of December 7, 1941, making it one of the most visited historical destinations in the United States.