In Cities Over Time, early fluent readers will see and learn about the historical and infrastructural growth of U.S. cities over time. Real-life photographs compare cities and their skylines then and now. Features include sidebars, reading tips for teachers and parents, a table of contents, STEM engineering activity, glossary, index, and STEM infographic that details the stages of skyscraper construction. Children can learn more about infrastructure using our safe search engine that provides relevant, age-appropriate websites. Cities Over Time is part of Jump!'s Our Changing World series.