Ellis Island National Monument is a historic site located in New York Harbor. It was the gateway for millions of immigrants to the United States from 1892 to 1954. The monument is named after Samuel Ellis, who owned the island in the 18th century. It is now part of the Statue of Liberty National Monument and is managed by the National Park Service. Visitors can explore the museum, which contains artifacts from the immigration experience, as well as take a ferry ride to the island.