Where in the world can you find today’s oldest existing fortress? How many people does it take to build a castle? What is the heaviest-sized boulder that could be thrown by a trebuchet? Find out the answers to these questions and more in DKfindout! Castles. From the earliest stone strongholds to the most elaborate fairy-tale fortresses in Germany, India, and Japan, kids will learn about every aspect of life in medieval society, including farming, food and feasting, entertainment, and, of course, knights!