Lancaster Castle is a historic fortress located in Lancaster, England. Originally built in the 11th century, it has served various purposes over the centuries, including a royal residence, a prison, and a court. The castle features impressive architecture, including a gatehouse and a well-preserved keep, showcasing its medieval heritage. Today, Lancaster Castle is a popular tourist attraction, offering guided tours that highlight its rich history. Visitors can explore the castle grounds, learn about its role in the English legal system, and discover stories of notable prisoners, including Mary, Queen of Scots.