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Rich from oil, shipping, and banking revenues, the city of Dubai has entered the 21st century as a Middle Eastern boomtown. Tourism and real estate development are now major sectors of Dubai's economy. Although development has slowed in the wake of the global financial crisis, at one time the city was estimated to have up to a quarter of the entire world's construction cranes. Dubai is now a vertical metropolis filled with impressive modern skyscrapers, including the world's tallest building, the Burj Khalifa, which opened in 2010. The ubiquity of construction cranes across the skyline has led some to give them an affectionate nickname: the "birds of Dubai."