Istanbul, Turkey's largest city, is a hot favourite for many tourists. Major attractions include the "Blue Mosque", the Hagia Sophia, the Basilica Cistern and the Galata Tower. In addition, there is the Grand Bazaar which is among the world's oldest and largest covered markets. Another must-visit is the the Topkapı Palace, the seat of Ottoman power for over three centuries. And of course, there is the hamam experience.