Two architectural wonders helped put Dubai on the map: the Burj Al Arab hotel, which resembles the sail of a ship out on the gulf waters, and the Palm Jumeirah, a residential development on a manmade archipelago that fans out in the shape of a huge palm tree. But in 2010, the sleek Burj Khalifa stole their thunder. Now the world’s tallest structure, the tower soars 830 meters (2,722 feet) into the sky. Visitors can zoom by elevator up to the 124th floor to experience incredible views and explore interactive displays on Dubai's history and the tale behind the building of this futuristic marvel. Another observation deck is even higher, on the 148th floor.