Although it looks like stone, the Bulgarian St. Stephen Church with its richly ornamented façade on the shores of the Golden Horn in Istanbul, Turkey, is made of iron. It was cast in Vienna, floated down the Danube and across the Black Sea on barges, and bolted together here in Istanbul in 1871. It is possibly the largest prefabricated cast iron structure in the world.
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The Bulgarian St. Stephen Church in Istanbul is the largest prefabricated cast iron structure in the world. Photo: Daphnusia | Dreamstime.com