Turkey is a country straddling eastern Europe and western Asia with social associations with antiquated Greek, Persian, Roman, Byzantine and Ottoman realms. Cosmopolitan Istanbul, on the Bosphorus Strait, is home to the notable Hagia Sophia, with its taking off vault and Christian mosaics, the gigantic seventeenth century Blue Mosque and the around 1460 Topkapı Palace, previous home of sultans. Ankara is Turkey's cutting edge capital.