5Explores how a castle's design helps it fulfill its purpose, and challenges readers to build their own cardboard castles. Vivid photographs and easy-to-read text aid comprehension for early readers. Features include a table of contents, an infographic, a supply list, Think About It critical thinking questions, Making Connections questions, a glossary, and an index. QR codes in the book give readers access to book-specific resources to further their learning. Aligned to Common Core Standards and correlated to state standards. DiscoverRoo is an imprint of Pop , a division of ABDO.