Street View's fine for navigation, but we're sure plenty more people use it just for their armchair tourism. Google has now turned its attention to giving thrill-seekers a chance to gaze out from the top of Dubai's Burj Khalifa, the world's tallest building. Using Trekker backpacks and trolleys, it took the Googlers three days to capture the images from both the viewing gallery on the 124th floor and the window cleaning gantry on the 80th. Curious to experience some of that vertigo for yourself? Video's after the break.