Built in 1846 at the height of Nantucket’s whaling prosperity, the Hadwen House is a grand Greek Revival mansion that offers a rare glimpse into the island’s wealthiest era. Now operated by the Nantucket Historical Association as a museum, it features period rooms, decorative arts exhibits, and a beautifully maintained Victorian garden. Located on Main Street, it’s one of the most striking historic homes open to the public on Nantucket.