Hagley Museum and Library

The Hagleuy Museum in Wilmington, Delaware is located on a gorgeous 200-acre estate on the banks of Brandywine Creek and gives an interesting overview of the DuPont family, it's importance in the region, and American industrial and technological advancement in general. The entire museum estate and lots of little interesting corners to discover: 19th-century machine shops, gunpowder mills, a massive library full of photos, books, and manuscripts, and plenty of scenic gardens along Brandywine Creek.

One of the neatest parts of the museum is Eleutherian Mills, the original family home of the DuPonts.