Wallingford Castle is a historic castle located in Wallingford, Oxfordshire, England. Originally built in the 11th century, it served as a royal fortress and played a significant role in various conflicts, including the English Civil War. The castle features a motte-and-bailey design, with a large earth mound and a surrounding ditch. Today, the castle ruins are a popular tourist attraction, offering visitors a glimpse into medieval architecture and history. The site is managed by English Heritage, and visitors can explore the remnants of the walls and towers, as well as enjoy scenic views of the surrounding area.