Buy one general admission to Hagley Museum, and receive one free admission of equal or lesser value. Cannot be combined with any other offer. Limit one coupon per transaction. Valid 7/6/20-9/30/20. Address: 200 Hagley Creek Road, Wilmington, DE 19807 Located on 235 acres along the banks of the Brandywine in Wilmington, Delaware, Hagley is the site of the gunpowder works founded by E. I. du Pont in 1802. This example of early American industry includes restored mills, a workers' community, and the ancestral home and gardens of the du Pont family.