London: New York Is the World's Most Economically Powerful City.
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Istanbul is a city in Turkey that straddles Europe and Asia across the Bosphorus Strait. The Old City reflects cultural influences of the many empires that once ruled here. In the Sultanahmet district, the openair, Romanera Hippodrome was for centuries the site of chariot races, and Egyptian obelisks remain. The iconic Byzantine Hagia Sophia features a soaring dome and Christian mosaics.