 In 2010, a memorial plaque was installed to "honor the 23 people who lived in Greenwich, or had a connection to the town", who died in the September 11, 2001 attacks.In 1991, the Great Captain Island Light was added to the National Register of Historic Places.In 1829, the federal government purchased 3.5 acres of land on the southeast part of Great Captain Island from Samuel Lyons, prior to the site being selected for a lighthouse.