People built castles for protection and defense. Many castles are sites of legends about royalty and warriors from the past. Some castles, like Windsor Castle, are famous for their paintings and treasures on display, as well as stories of royal ghosts. Other notable castles mentioned include Balmoral Castle, where Prince Albert built a home for himself and Queen Victoria, and structures like the Tower of London, known for its guards in distinctive uniforms. Legendary castles like those associated with King Arthur are often locations for tales of ghosts from the past said to still inhabit the castles' tunnels.