"For thousands of years, the Great Wall of China has stretched across China's Northern provinces. It winds like a giant, sleeping dragon from the Pacific coast in the east to the Gobi Desert in the west. But it's not the only wall in China. Learn abou the buidling techniques used, the empires who constructed them, and what their pruposes were over the centuries in this informative book. Put your walking shoes on and get ready to explore all the interesting...

"How can we get from one place to another when something blocks our way? It might be a rushing river. Or it might be a huge cavern or a deep ravine. The answer to that question is to build a bridge. Learn about the different types of bridges, the civilizations and people who engineered and risked their lives to construct them, and the advances in bridge building that have made them safe and effective ways to keep us moving!" --cover.