Lonaconing Furnace also known as The George's Creek Coal and Iron Company Furnace No. 1 is a historic iron furnace in Lonaconing Allegany County Maryland United States. It is a truncated square pyramid constructed of sandstone 50 feet high 50 feet square at the base and 25 feet square at the top. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Building