Buchanan Castle is a historic ruin located near the village of Buchanan in Scotland. Originally built in the 18th century, it served as the seat of the Buchanan family. The castle features a mix of architectural styles, reflecting its various renovations over the years. Today, the castle is mostly in ruins, but its picturesque setting by Loch Lomond attracts visitors. The surrounding grounds are part of a larger estate, which includes gardens and woodlands, making it a popular spot for walking and exploring the natural beauty of the area.