Turkey has become a popular destination for culture, spa, and health care tourism. Istanbul is one of the most important tourism spots not only in Turkey but also in the world. Turkey's largest city, Istanbul, has a number of major attractions derived from its historical status as capital of the Byzantine and Ottoman Empires. These include the Sultan Ahmed Mosque (the "Blue Mosque"), the Hagia Sophia, the Topkap─▒ Palace, the Basilica Cistern, the Dolmabah├že Palace, the Galata Tower, the Grand Bazaar, the Spice Bazaar, and the Pera Palace Hotel.