Old Castile, or Castilla la Vieja, is a historical region in northern Spain. It was one of the original kingdoms that formed the modern nation. Known for its rich cultural heritage, Old Castile includes cities like Burgos and Palencia, which are famous for their medieval architecture and historical significance. The region is characterized by its diverse landscapes, ranging from rolling plains to rugged mountains. It played a crucial role in the formation of the Castilian language and culture, which later influenced the entire Spanish-speaking world. Today, Old Castile is celebrated for its traditions, gastronomy, and vibrant festivals.