"Castle" by David Macaulay is a juvenile nonfiction book published by HarperCollins in 1977. The book delves into the history of castles in Europe, with a focus on architecture, military strategies, and people and places in Europe. Macaulay, the author and illustrator, brings the story to life through detailed and engaging illustrations, making it an educational and visually appealing read for young readers. With 80 pages and a trade paperback format, this book is a valuable addition to any collection focused on history and architecture.