Winterthur Museum, Garden and Library is an American estate and museum in Winterthur, Delaware. As of 2011 it houses one of the most important collections of Americana in the United States of America. It was the former home ofHenry Francis du Pont (1880–1969), a renowned antiques collector and horticulturist. Until recently, it was known as the "Henry Francis DuPont Winterthur Museum".