Tourism Plays a vital role in the economy of the United Arab Emirates, with the number of visitors surpassing 10 million tourists per year.[7] Dubai maintains the highest share of tourists among the other emirates. Dubai gained a lot of media attention with ambitious mega-projects like: Burj Khalifa, the world's highest tower, The Dubai Mall, the world's biggest shopping mall, the Palm Islands, a series of three artificial palm-shaped islands, the World Islands, the man-made archipelago in the shape of the world map, Burj Al Arab, the world's only 7-star hotel, Madinat Jumeirah, a 40 hectares traditional Arabian resort town, Dubai Marina, a 3-km long canal city with the highest residential tower in the world, Dubai Fountain, Ski Dubai, Downtown Burj Dubai, among several others. Dubai also maintains some historic landmarks, dating back to the city's heritage as a small fishing and trading outpost along the Persian Gulf, like the: Dubai Creek, a saltwater inlet that was the center of Dubai's ancient trade and pearling industry, Dubai Spice Souk, the old merchants' market selling frankincense, shisha, herbs, textiles, incense, rugs and artifacts, Dubai Gold Souk, a traditional bustling Souk with over 300 gold retailers, Grand Mosque (Dubai), a century-old sandstone mosque with a 70-meters high minaret, Al Bastakiya, a well-preserved old town famous for its iconic Wind Towers, Al Ahmadiya School, one of the most ancient educational institutions, Al Fahidi Fort, an 18th-century grand Arabian Fort turned into a museum, Al Souk Al Kabir, one of the oldest residential & commercial districts in Dubai, among several other sites.