Tourism in Turkey important tourism spots not only in Turkey but also in the world. There are thousands of hotels and other tourist-oriented industries in the city, catering to both vacationers and visiting professionals. Turkey's largest city and metropolis and a leading global 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 Topkapı Palace, the Basilica Cistern, the Dolmabahçe Palace, the Galata Tower, the Grand Bazaar, the Spice Bazaar, and the Pera Palace Hotel. Istanbul has also recently
Galata Bridge Bridge. The fourth Galata Bridge was built in 1912 by the German firm Hüttenwerk Oberhausen AG for 350,000 gold liras. This floating bridge was long and wide. It is the bridge, still familiar to many people today, that was badly damaged in a fire in 1992 and towed up the Golden Horn to make way for the current bridge. The fifth Galata bridge was built by the Turkish construction company STFA just a few meters away from the previous bridge, between Karaköy and Eminönü, and completed in December 1994. It was designed and supervised by GAMB (Göncer Ayalp Engineering Company).