St. Andrews Cathedral is a historic ruin located in St. Andrews, Scotland. It was built in the 12th century and served as the center of the medieval Scottish Church. The cathedral was once the largest in Scotland, showcasing impressive Gothic architecture and intricate stone carvings. The cathedral complex includes the remains of the St. Andrews Castle and a graveyard, which adds to its historical significance. Although it fell into disrepair after the Protestant Reformation in the 16th century, it remains a popular tourist attraction, drawing visitors interested in Scotland's rich religious history.