Istanbul, Turkey's largest city, is located on two continents spanning over 707 square miles. It has a population of over 12 million people and is an important economic and cultural center. Some of its most notable attractions include the Hagia Sophia, Topkapı Palace, the Blue Mosque, Basilica Cistern, Grand Bazaar and Spice Bazaar. Istanbul has a predominantly mild climate in the summer but cold and snowy winters. It plays a major role in Turkey's economy through industries like transportation, chemicals and tourism. The city also has several prestigious universities and is a center for sports in Turkey.