Abermydyr Castle is a 12th-century castle ruin situated in the Brecon Beacons National Park, Powys, Wales. The castle's history dates back to the 12th century when it was built by the Normans. It features a unique blend of medieval and Tudor architectural styles, with its most prominent feature being the 15th-century tower house. The castle has witnessed several battles and sieges throughout its history, including the English Civil War. Today, visitors can explore the castle's remains, including its towers, battlements, and curtain walls, while taking in the breathtaking views of the surrounding countryside.