An iron furnace is a large industrial structure used to produce iron from iron ore. The process involves heating the ore with a fuel source, typically coke, in the presence of limestone to remove impurities. The intense heat causes the iron ore to melt, allowing the molten iron to be collected at the bottom of the furnace. Iron furnaces have been essential in the development of the steel industry and have played a significant role in the production of various iron products. They are often associated with the Industrial Revolution, which saw a dramatic increase in iron production and usage in construction and manufacturing.