Longwood Gardens- a Dupont estate that is now a world famous 1100 acre botanical garden (https://longwoodgardens.org/)
Winterthur- a Dupont estate that now features the most significant collection of American decorative arts in the world and a world-class naturalistic garden set within 1,000 acres ... (https://www.winterthur.org/)
Nemours- a 77 room Dupont mansion with the largest formal gardens in North America (http://www.nemoursestate.org/)
Hagley Museum- the original Dupont home and the site of the gunpowder mills that began the company (https://www.visitwilmingtonde.com/listing/hagley-museum-and-library/1165/)
Brandywine Valley Art Museum- site of regional and American art showcasing the works of the Wyeth family (https://www.brandywine.org/museum)
New Castle- colonial city on the banks of the Christina River (https://www.newcastlehistory.org/)
Valley Forge- site of Washington's encampment 1777-1778 (https://www.nps.gov/vafo/index.htm)
Lancaster County- (Pennsylvania Dutch country) home to the Amish sect, known for their simple life style devoid of technology, electricity, modern means of transportation (https://www.nps.gov/vafo/index.htm)
Philadelphia- birthplace of America (https://www.visitphilly.com/articles/philadelphia/most-essential-things-to-do-in-philadelphia/#bonus-more-things-to-do-in-greater-philadelphia)
Washington DC- national capital (a 90 minute train ride) (https://www.washington.org/)
NYC- ( a 90 minute train ride) (https://www.nycgo.com/)