World's Tallest Skyscrapers: Beyond the Clouds

Engineer and film-maker Rob Bell presents an exploration of the global phenomenon that is the skyscraper, from the world's tallest building to those currently under construction. Rob examines the tallest of them all - the Burj Khalifa in Dubai, standing at almost 830m - where he discovers what it takes to build this high, and meets the woman responsible for the foundations of the Shard.