The observation deck at Burj Khalifa, the world’s tallest building, has been shut down on Sunday after just a month from its grand opening.

Officially… the deck has been temporarily closed due to unexpected high traffic, and that it’s needing maintenance with some power supply issues [via Reuters].
Unofficially… 15 passengers were left stranded for 45 minutes after a lift broke (probably because of the power supply problem), which sounded like a small explosion as described by a visitor [via Timesonline].
Candid… the power issue was caused by the finger [image by Shaunjones].
56 random facts and figures of Burj Khalifa, the world’s tallest structure…

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The Burj Dubai has become the tallest man-made structure in the world.

Burj Dubai as of early March 2008 [Image by Aheilner@
Wikipedia]
According to developer Emaar Properties PJSC, the Burj Dubai has surpassed the height of KVLY-TV mast, a 628.8m TV transmitting mast in North Dakota, USA.
The Burj Dubai is expected to be over 700m in height upon completion. The developer is still keeping the final height as classified to avoid competition from other tallest-buildings-wannabe currently in construction.
[Update] Burj Dubai is renamed as Burj Khalifa and officially opened in Jan 2010.
The Burj Dubai – which is under construction – in the United Arab Emirates is unofficially the world’s tallest building after reaching the height of 512.1 metres on July 20, surpassing current record holder Taiwan’s Taipei 101 (509.2m).
However, the Council on Tall buildings and Urban Habitat will classify Burj Dubai as a building only after it is completed, which means that Taipei 101 is still officially the world’s tallest building. The CN Tower in Toronto, Canada, remains the tallest free-standing-structure at 553m (probably not for long though).
[Update] Burj Dubai is renamed as Burj Khalifa and officially opened in Jan 2010.