Istanbul sits at literal and cultural crossroads. Straddling Europe and Asia, the city has been a gateway for empires, trade routes, ideas, and cultures for over 2,000 years. Known successively as Byzantium, Constantinople, and Istanbul, it served as the capital of the Roman, Byzantine, and Ottoman Empires. Control of the Bosphorus gave it strategic power, linking the Black Sea to the Mediterranean and East to West. Merchants, pilgrims, and armies all passed through its streets. As a result, Istanbul became not just a place of passage, but a center where civilizations blended and reshaped world history. Modern Istanbul is filled with reminders of those cultures and events.