Winterthur in northwestern Delaware grew from farmland assembled by Éleuthère Irénée du Pont in the early 19th century into a du Pont family estate centered on a Greek Revival manor built between 1839 and 1842 and named for Winterthur, Switzerland. Its defining transformation came under Henry Francis du Pont, who expanded and refashioned the house into period rooms filled with American decorative arts and opened it as a public museum in 1951. With major library holdings, graduate programs developed with the University of Delaware, extensive gardens, and protected natural lands, Winterthur became a leading center for Americana, scholarship, and landscape preservation.

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