BBC series Supersized Earth filmed science reporter Dallas Campbell as he worked with the brave men whose job is to clean the windows of the world's tallest building, the Burj Khalifa in Dubai. This beautifully shot, fascinating video shows off the gorgeous views from the top and touches on the special architectural considerations necessary for the safety of a building that size, as the score from Alfred Hitchcock's Vertigo aptly plays in the background. -Via The Presurfer