Giving young readers a view into the inner workings of urban areas, this guide educates kids about all the parts that come together to make cities work by answering such questions as, How did people create subways? How does the water get to the very top of a skyscraper? and Is there any organization to a bustling metropolis? Fascinating sidebars, unique illustrations, Words to Know, and Did You Know facts combine with age-appropriate, hands-on activities to make learning about complex urban environments fun while reinforcing learning.