St Andrews Castle, located in the coastal town of St Andrews in Scotland, is a historic ruin perched on a rocky promontory overlooking the North Sea. Built around 1200, it served as a residence for powerful bishops and later became a notorious prison during the Scottish Reformation. The castle saw its fair share of conflicts, including being besieged and rebuilt multiple times during the Wars of Scottish Independence. With its intriguing history, including hosting notable figures like James I of Scotland and being the site of religious persecution, St Andrews Castle remains a fascinating glimpse into Scotland's past.