Lochleven Castle

Lochleven is a tower house and courtyard type of castle on an island in Loch Leven, just east of (and clearly visible from) the M90, although you do need to take a boat trip to reach it. The site is managed by Historic Environment Scotland, and open seasonally, weather permitting. The stone courtyard wall dates to the first half of the 14th century at the latest, and the tower-keep to the end of that century.

Lochleven was held by the Douglas family from about 1390, and was retained by them into the 16th century as a residence, meaning that William Douglas of Lochleven was the jailer of Mary Queen of Scots when she was imprisoned here. Twenty years later, Douglas became Earl of Morton and inherited more impressive palaces, meaning that he abandoned Lochleven. It was sold in the 1670s, and the castle became a picturesque focal point of the grounds around Kinross House until handed to the state in 1939.

Official Historic Scotland page

HES Canmore database entry