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SahilOnline: World's tallest building Burj Khalifa opens in Dubai; A dramatic fireworks and lights show took place around the tower while a screen displayed its exact height, which had previously been kept secret. At 828m, Burj Khalifa dwarfs the 508m Taipei 101 and the 629m KVLY-TV mast in the US, the tallest man-made structure. Its spire can been seen 95km (60 miles) away.