North Castle is a fictional location in the popular LEGO series, particularly known from the LEGO Ninjago universe. It serves as a stronghold for the ninja heroes, where they train and prepare to face various villains. The castle is filled with intricate designs, secret passages, and advanced technology, making it a fascinating place for both characters and fans alike. In the story, North Castle is often depicted as a place of wisdom and strategy, where the wise Sensei Wu guides the young ninjas. The castle symbolizes teamwork and bravery, as the ninjas work together to protect their home and the world from evil forces like Lord Garmadon.