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The tallest building ever built up to 2011 is Burj Khalifa in Dubai. Dubai is one of the seven emirates of the United Arab Emirates (UAE). UAE consists of seven states, termed emirates (because they are ruled by emirs), which are Abu Dhabi, Ajman, Dubai, Fujairah, Ras al-Khaimah, Sharjah and Umm al-Quwain. The capital and second-largest city is Abu Dhabi, which is also the country's center of political, industrial and cultural activities.