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Turkey is a nation straddling eastern Europe and western Asia with cultural connections to ancient Greek, Persian, Roman, Byzantine and Ottoman empires. Cosmopolitan Istanbul, on the Bosphorus Strait, is home to the iconic Hagia Sophia, with its soaring dome and Christian mosaics, the massive 17th-century Blue Mosque and the circa-1460 Topkapı Palace, former home of sultans. Ankara is Turkey’s modern capital. Turkey has 17 UNESCO World Heritage Sites, such as the "Historic Areas of Istanbul", the "Rock Sites of Cappadocia", the "Neolithic Site of Çatalhöyük", "Hattusa: the Hittite Capital", the "Archaeological Site of Troy", "Pergamon and its Multi-Layered Cultural Landscape", "Hierapolis – Pamukkale", and "Mount Nemrut"; and 51 World Heritage Sites in tentative list, such as the archaeological sites or historic urban centres of Göbekli Tepe, Gordion, Ephesus, Aphrodisias, Perga, Lycia, Sagalassos, Aizanoi, Zeugma, Ani, Harran, Mardin, Konya and Alanya. Turkey is home to two of the Seven Wonders of the Ancient World, the world's oldest religious site Göbekli Tepe, and numerous other World Heritage Sites.