Bulgarian St. Stephen Church (The Iron Church)
This Bulgarian Orthodox church on the Golden Horn shoreline is built almost entirely of prefabricated cast iron, cast in Vienna in the 1890s and shipped down the Danube and across the Black Sea. The Neo-Byzantine and Gothic frame was bolted together on site, and a careful restoration in the 2010s returned its painted iron interior to full glory. It remains an active place of worship and a quietly astonishing piece of engineering.
Why go: One of the world's few surviving iron churches, gleaming and almost crowd-free beside the water.








