 The island was added to the National Park Service system in May 1965 by President Lyndon B. Johnson and is still owned by the Federal government as part of the Statue of Liberty National Monument.Ellis Island was opened to the public as a museum of immigration in 1990.On September 11, 2001, two of four hijacked planes were flown into the Twin Towers of the original World Trade Center in Lower Manhattan, and the towers collapsed.