6. Istanbul
Formerly called Constantinople, Istanbul is the only city in the world to straddle two continents. The remarkable mix of western and eastern influence here makes Istanbul a fascinating world city. Founded by the Greeks in the 7th century BC, it’s a city packed with history. Places to see include the famous Blue Mosque, the opulent Topkapi Palace, the historic hub of Sultanahmet Square, impressive 6th century Sunken Palace cisterns and the great Hagia Sophia.
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