TRIVIA: Which completed building is the tallest in the world today?
Based on the announcement by the COUNCIL ON TALL BUILDINGS & URBAN HABITAT or CTBUH, the tallest building in the world on record for 2011-2012 is the iconic BURJ KHALIFA or BURJ DUBAI found in Dubai, UAE. It has a height of 828 m (2,717 ft) with 163 floors.
Running second & third respectively are TAIPEI 101 in Taipei, Taiwan at 509 m (1,670 ft) high with 101 floors
& SHANGHAI WORLD FINANCIAL CENTER in Shanghai, China at 429 m (1,614 ft) high, also with 101 floors.
For the complete list & building details, check out the Skyscraper Center.