Explore Loudoun County’s largest grist mill with an engaging guided tour. Step inside the historic merchant mill in Aldie and discover its remarkable fully automated design. Experience the power of the tandem waterwheels and learn how geography and technology shaped the mill’s location and success. Along the way, learn the rich history of the Village of Aldie — a community that has flourished for more than 215 years!*

After World War II, the Washington, DC, area was growing fast and needed ever more electricity. In 1954 the Potomac Electric Power Company (PEPCO) bought 500 acres along the Potomac River in Sterling, Virginia, to build a coal powered plant.