The Customs House in New London was constructed in 1833 and is the oldest continuously-operated customs office in the United States. This building is still a functioning customs building for the city of New London. Another notable feature of this building is that it was designed by Robert Mills, architect of the Washington Monument. The Customs House is today home to the maritime museum that offers a glimpse into the town's fascinating history and culture as well as the famous story of the Amistad. Group tours of the museum can be arranged on request. The museum also offers special lighthouse and boat trips, a museum shop, and interesting temporary exhibitions.