Dubai is the largest and most populous city in the United Arab Emirates (UAE). Dubai is the ideal location to visit in November, offering a kaleidoscope of attractions such as Burj Khalifa, the tallest building in the world and the centerpiece of downtown Dubai; the Dubai mall, the world’s most visited and largest shopping & entertainment destination Atlantis, the palm which houses the aqua venture water park and the lost chamber aquarium, among many others. Dubai has attracted world attention through large construction projects and sports events, in particular the world's tallest building, the Burj Khalifa. As of 2012, Dubai was the most expensive city in the Middle East.The sandy desert surrounding the city supports wild grasses and occasional date palms. Desert hyacinths grow in the sabkha plains east of the city, while acacia and ghaf trees grow in the flat plains within the proximity of the Western Al Hajar mountains.