Towering Cranes

The astounding sky scrapers we see reaching for the sky would not be possible without the help of cranes. Cranes are machines used to lift heavy things, and they're often found at construction sites. The tallest cranes can lift loads 47 stories up. Readers will learn about crane parts and how they work together to get things off the ground. Full-color photographs show cranes at their best, lifting the heaviest loads sky-high.