When it comes to buildings, readers 5 to 8 like them to be big and even downright extreme. This book delivers with features on such wonders as the Hoover Dam, the Petronas Towers, London's Olympic Stadium, the Gherkin, the 35-mile Gatthard Base Tunnel, Dubai's Palm Islands, and Utah's Bingham Canyon Mine. Along with foldout pages, diagrams, and photographs, the entries include texts on how and why these structures were built, explaining the physics that bolster these designs, and even the occasional close call that can occur.