Ancient landmark Hagia Sophia, 'simply unique, without parallel,' attracts long line of tourists

When Western tourists who are visiting Istanbul, Turkey, cruise into a port, many typically look for one particular landmark: the Hagia Sophia. 

Identifying the ancient temple, which has served as a church, museum and mosque, may be tricky from a distance. Istanbul’s skyline appears to be peppered with look-alike large mosques with Byzantine-style domes and tall minarets surrounding them. 

There is the Süleymaniye Mosque, built in the 16th century to rival the Hagia Sophia, on the orders of Sultan Süleyman...