The Bulgarian St. Stephen Church in Istanbul, Turkey, has the detailed ornaments of an Orthodox stone church, but it’s actually made of prefabricated cast iron elements.
Sometimes referred to as ‘The Iron Church’, St. Stephen Church is considered the largest prefabricated cast iron building in the world. It consists of thousands of prefabricated pieces of cast iron, from large walls, to small, intricate decorations, all of which weigh over 500 tons. As almost the entire structure and its exquisite décor are cast out of iron, a close inspection reveals the heads of the large screws holding it together everywhere you look.