Eilean Donan, Scotland
Eilean Donan, or the island of Donan, is perhaps one of the most well-known medieval castles in the Western Highlands of Scotland, and not just because of its 1986 feature in the film Highlander.
The castle has a long history dating back to the 6th century. Historians believe the fortress was named after Irish Saint, Bishop Donan, who came to Scotland around 580 AD. There are several churches dedicated to the Saint, so it’s possible this may be a cell or community he created at the time.