Today, Science Wonders is going to take you to discover some of the biggest buildings ever built by man. We will climb aboard the biggest machine in the world and then, we'll go to Chili to see the mine which holds within its depths a quarter of the copper reserves of the planet. We will then visit the factory of all the records and will watch towers and giant bridges being built. And to conclude, we come to China to see the construction of one of the biggest works in the world: Three Gorges dam.