Istanbul historically known as Constantinople and Byzantium, is the most populous city in Turkey and the country's economic, cultural, and historic center. Istanbul is a transcontinental city in #Eurasia, straddling the Bosporus strait between the Sea of #Marmara and the #BlackSea. Its commercial and historical center lies on the European side and about a third of its population lives on the Asian side. The city is the administrative center of the Istanbul Metropolitan Municipality, both hosting a population of around 14.7 million residents. #Istanbul is one of the world's most populous cities and ranks as the world's 7th-largest city proper and the largest European city.
Founded under the name of #Byzantion on the Sarayburnu promontory around 660 BCE, the city developed to become one of the most significant in history. After its reestablishment as Constantinople in 330 CE, it served as an imperial capital for almost 16 centuries, during the Roman, Byzantine (3301204 and 1261–1453), the Latin (1204–1261) and the Ottoman (1453–1922) empires. Istanbul's strategic position on the historic Silk Road, rail networks to Europe and the Middle East, and the only sea route between the Black Sea and the Mediterranean have produced a cosmopolitan populace, although less so since the establishment of the Turkish Republic in 1923.
The population of the city has increased tenfold since the 1950s, as migrants from across Anatolia have moved in and city limits have expanded to accommodate them. Approximately 12.56 million foreign visitors arrived in Istanbul in 2015, five years after it was named a European Capital of Culture, making the city the world's fifth most popular tourist destination. The city's biggest attraction is its historic center, partially listed as a #UNESCO World Heritage Site, and it’s cultural and entertainment hub can be found across the city's natural harbor, the #GoldenHorn, in the Beyoğlu district.
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