Dubai built six tall towers last year, and its 23 Marina -- at 1,289 feet -- is the tallest residential building in the world, according to the Council on Tall Buildings and Urban Habitat. This piece explores the countries with the highest numbers of tall buildings. "Looking to the future, it is now foreseeable -- indeed likely -- that the recent trend of an annual increase in building completions will continue for the next several years, perhaps even through the end of the decade," the CTBUH said.

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