Placed on the National Register of Historic Places in 1973, the Lonaconing Furnace was built in 1836 by the George's Creek Coal and Iron Company. Iron was first produced here until 1856. It was the first furnace in the country to successfully produce iron using coke and bituminous coal. The furnace is a truncated pyramid structure reaching 50 feet high, with a 50 feet square base and a 25 feet square top. The top house, molding house, and steam engine house, which had two steam engine-powered hot blasts (the furnace was also the first to use to use this type of engine), no longer exist at the site, which is now a small park.