St. Stephens of the Bulgars church

St. Stephen of the Bulgars Church, also known as the Bulgarian Iron Church, is a remarkable architectural marvel and one of the few surviving prefabricated iron churches in the world. Its unique construction involved casting each section piece by piece in Vienna between 1893 and 1896. Once completed, the entire structure was shipped down the Danube River and transported to Istanbul via the Black Sea. Resembling a giant Meccano set, the church took one and a half years to assemble on-site. It opened its doors on September 8, 1898 and stands today as a rare example of 19th-century prefabricated iron architecture.