Buchanan Castle is a ruined castle in Stirlingshire, Scotland, located 1 mile (1.6 km) west of the village of Drymen. The house was commissioned by The 4th Duke of Montrose and built in 1852-1858 as a home for the Montrose family, serving as such until 1925. It was built as a replacement for Buchanan Auld House, which is located 0.5 miles (0.80 km) to the northwest but was destroyed in a fire in 1852. The old house and surrounding lands had been the property of the Clan Buchanan but passed to th