Where the DuPont Company Was Born on the Brandywine

235 Acres of Industrial History, Black Powder Mills, a du Pont Family Home, and One of America’s Greatest Business History Libraries

On 235 wooded acres along the Brandywine Creek in northern Delaware, the Hagley Museum and Library preserves one of the most complete surviving industrial landscapes in America: the original black powder works of the du Pont Company, founded in 1802 by French immigrant Éleuthère Irénée du Pont on the banks of a river whose fall over the geological Fall Line provided exactly the water power he needed. The powder yards operated for nearly a century and a half. What remains — the stone mills, the workers’ community, the ancestral family home and gardens, the research library — is a museum unlike anything else in the region.

Hagley Museum is open six days a week, 10:00 a.m.–5:00 p.m., with last admission at 4:00 p.m. The museum is closed every Wednesday to the general public. Arrival before 3:00 p.m. is strongly encouraged given the size of the property. Always verify current hours at hagley.org before your visit.

On Wednesdays, the museum is closed to the general public but remains open for pre-booked group tours, school programs, Summer Nights at Hagley (Wednesday evenings in summer), and Hagley Member walking access.

In January, only the Nation of Inventors indoor exhibition and the Museum Store are open; the grounds are closed to the general public.

Admission: Adults $22 | Students and Seniors (62+) $18 | Children ages 6–14 $12 | Children under 6 and active military: Free | Members: Free. The guided tour of the Eleutherian Mills residence is included in general admission. Free parking is available at the Visitor Center. A free shuttle runs between key locations throughout the 235-acre property.

Ways to save: Delaware library cardholders can access Hagley free through the Delaware Library Museum Pass Program. Art-Reach ACCESS and EBT cardholders receive $2 admission for up to four people. Smithsonian Affiliate members receive free admission. NARM members receive reciprocal benefits. Check hagley.org/ways-save for the full list.

The Founding of an American Dynasty: E.I. du Pont and the Brandywine Powder Works

Éleuthère Irénée du Pont de Nemours was born in Paris in 1771, the son of economist and statesman Pierre Samuel du Pont de Nemours. He trained in chemistry and gunpowder manufacturing under the legendary Antoine Lavoisier at the French government’s powder works before emigrating with his family to the United States in 1800. What he found in America surprised him: gunpowder of inferior quality and far too little of it, in a new nation that needed it urgently.

In 1801, he purchased land along the Brandywine Creek in Delaware for $6,700. He chose the site with the precision of a trained chemist: the river’s drop over the Fall Line provided steady water power; the surrounding forests supplied timber for the charcoal essential to superior black powder; willow trees grew abundantly (willow charcoal was the preferred grade for gunpowder); and sulfur and saltpeter could be shipped up the Delaware River from Wilmington’s port.

The powder works opened in 1802. By the War of 1812, the du Pont mills on the Brandywine were supplying a significant portion of the gunpowder used by American forces. The company grew steadily through the 19th century, eventually becoming the largest manufacturer of gunpowder in the United States and — later, after its transformation into a chemical and industrial conglomerate — one of the largest corporations in American history.

The powder works operated on the Brandywine until 1921. The Eleutherian Mills-Hagley Foundation acquired the property in 1952 and opened it as a museum. The research library — now one of the world’s leading repositories for the history of American business and technology — was dedicated in 1961.

Trivia: E.I. du Pont placed his own family home downwind of the powder mills — a calculated decision that kept the mansion in the blast path in case of explosion. This was not merely symbolic: he wanted his workers to know that he and his family shared the risk they faced daily. It is one of the more remarkable gestures of managerial accountability in American industrial history.

What to See at Hagley: A Self-Guided and Guided Experience

Hagley is a large indoor-outdoor museum. Most guests spend two to three hours; a full exploration of everything the property offers can take a full day. The Visitor Center is the starting point for all visits.

Nation of Inventors Exhibition (Visitor Center)

Hagley’s flagship indoor exhibition celebrates diverse stories of American innovation and invention, connecting the history of the du Pont enterprise to the broader narrative of American technological creativity. Open year-round.

The Powder Yards

The historic black powder mills along Brandywine Creek are the museum’s industrial heart — a series of stone structures whose design incorporated deliberate fragility. The powder yard buildings were intentionally constructed with three heavy stone walls and one light wooden wall, so that explosions (which were common) would vent outward toward the river rather than causing catastrophic chain reactions through the yard. Walking through the restored powder yards, visitors see the water-wheel systems, the incorporating mills where ingredients were blended, the graining mills, and the packing house — a complete sequence of early American industrial processes.

Live gunpowder demonstrations and cannon firings take place regularly throughout the day — a genuinely dramatic experience that makes the abstract reality of working in the powder yards viscerally immediate.

Workers’ Hill

The hillside above the powder yards was home to the community of workers who operated the mills — an industrial village of stone cottages, a Sunday school, a community hall, and the material infrastructure of a 19th-century working community. The Workers’ Hill exhibits interpret daily life for the men and women who produced gunpowder on the Brandywine, their families, and the social world they created within the du Pont enterprise.

Eleutherian Mills (the First du Pont Family Home)

The Georgian-style residence built by E.I. du Pont himself in 1803 sits on a hillside above the powder yards — close enough that, as described above, it shared the blast risk of the works below. The house reflects five generations of du Pont family occupancy and is furnished to represent the family’s domestic life in the 19th century. Guided tours of the residence are included in general admission; timed tickets are arranged at the Visitor Center.

The French Garden

Adjacent to Eleutherian Mills, E.I. du Pont created a working kitchen garden modeled on the formal French kitchen gardens of his upbringing — a direct connection to his family’s European origins transplanted to a Delaware hillside. The garden has been restored and continues to be planted and maintained in the historical tradition.

The Renaissance Revival Garden

On the hillside below the mansion, a Renaissance Revival formal garden with terraces and statuary was created in the 1920s by Louise Evelina du Pont Crowninshield — a later generation du Pont who brought a very different aesthetic sensibility to the property. The contrast between E.I.’s practical French kitchen garden and Louise’s decorative terraced garden tells its own story about how the family’s relationship to the land evolved over a century.

The 19th-Century Machine Shop

A fully equipped period machine shop demonstrating the mechanical engineering and manufacturing capabilities that supported the powder works — an often-overlooked gem that speaks directly to the industrial capacity behind the du Pont enterprise.

Special Programs and Events

Summer Nights at Hagley

Wednesday evenings in summer, Hagley opens its grounds from 5:00–8:00 p.m. for a relaxed, family-friendly experience with gunpowder demonstrations, cannon firings, food available from the café, and the incomparable setting of the Brandywine on a summer evening. Admission is $5 per person; children under 6 free; members free. Dogs are welcome on leashes.

$5 Fridays After 5

On select Fridays during the warmer months, Hagley extends hours until 7:00 p.m. with $5 admission after 5:00 p.m. — making it one of the most affordable cultural evenings in the Wilmington area.

Science Saturdays

Monthly family programs connecting hands-on science activities to the history of invention and industry at Hagley. Included with admission.

Special Walking Tours

Themed expert-led tours of the grounds — covering topics including gunpowder production, water power, geology, industrial village life, the gardens, and more. Included with admission; reservations recommended.

Annual Events: Hagley Car Show, Hagley Craft Fair, Hagley 5K/1K run along the Brandywine, Fireworks at Hagley (members only), Holidays at Hagley (winter).

The Hagley Library and Research Collection

The Hagley Library is one of the world’s preeminent research collections for the history of American business and technology. Holdings include 37,000 linear feet of manuscripts and archives, 290,000 printed volumes, 2 million visual items, and more than 300,000 digital images documenting the history of American enterprise from the colonial era to the present. The library also holds the largest private collection of U.S. patent models in the world — approximately 5,000 models — with guided tours offering access to these miniature inventions.

Library research access is available by appointment, Monday through Friday. The research library entrance is at 298 Buck Road (separate from the museum entrance).