Cornwall, PA
The Cornwall Iron Furnace in Cornwall, PA is a mid‑19th‑century iron‑making complex that operated from 1742 to 1883 and produced cannon barrels for the Continental Army. The site retains its original furnace, blast equipment, and Gothic Revival buildings, allowing visitors to see where charcoal, limestone, and iron ore were processed into pig iron, stoves, and cannons. As the only intact example of an 18th‑ and 19th‑century Pennsylvania iron furnace in the Western Hemisphere, the location offers guided tours that explain the historical context and manufacturing techniques.