A castle typically features turrets, moats, and parapets. Turrets are tall towers that are often used for defensive purposes, such as providing a vantage point to spot enemies or to fire arrows from. Moats are deep ditches filled with water that surround the castle walls, making it difficult for enemies to breach the castle walls. Parapets are low walls that are built along the edge of the castle walls, providing additional protection for those defending the castle.