The Castle of St John is a historic fortress located in Dumfries, Scotland. Built in the 15th century, it served as a stronghold and a royal residence. The castle features thick stone walls and a central courtyard, showcasing medieval architecture. Today, the castle is a popular tourist attraction, offering visitors a glimpse into Scotland's past. It houses a museum that displays artifacts and information about the region's history, including its role in the Wars of Scottish Independence. The castle's scenic location also provides beautiful views of the surrounding area.