Ludgershall Castle stands as a ruined 12th-century royal residence in Wiltshire, owned and operated by English Heritage and open to the public. Built in the late 11th century by Edward of Salisbury and later improved by King John and Henry III in the 13th century, it served as a royal castle and hunting lodge before falling into ruin by the 16th century. The site features three remaining large walls including a prominent tower dating from the 12th century, with the northern enclosure containing the great hall and royal living quarters and the southern enclosure housing the bailey with stables and kitchens. The castle represents an important example of medieval royal architecture.