Kisimul Castle is a historic fortress located on Bardsey Island in Scotland. Built in the 15th century, it served as the stronghold of the MacNeil clan. The castle is notable for its impressive stone structure and picturesque setting, surrounded by the sea. The castle features a distinctive round tower and a courtyard, showcasing medieval architecture. It has been partially restored and is a popular tourist attraction, offering visitors a glimpse into Scotland's rich history. Access to the castle is typically by boat, adding to its charm and remoteness.