Burj Dubai

The Burj Dubai (Arabic for "Dubai Tower" but you might have a good chance of fooling newbies to Dubai that it means "don't look down") is a mixed use tower with commercial and residential areas, under construction in the Downtown Burj Dubai development, with an official opening date of 04 January 2010 (delayed from rumours of 09/09/09 and 02 December 2009 opening dates), and final height of 828m (kept secret until opening day and slightly higher than the most common rumour of 818m).
The tower's main claim to fame is that it is the tallest man-made structure in the world when completed, and in fact, the Burj Dubai attained that record before completion, in April 2008 when the height reached 629 meters. When completed, the top of the Burj Dubai was taller than the highest mountain peak (or hillock) of over 30 countries, including those lofty alpine nations of Belgium, Latvia, the Maldives, the Netherlands, and Uruguay, but not the UAE itself, which has a mountain top (Jebel Jais) in Ras Al Khaimah more than twice the height of the Burj Dubai. And to beat Mt Everest, you'd need to stack another 10 Burj Dubais on top of the first one.