Castle Stalker is implausibly picturesque, standing on an islet in Loch Laich, between Oban and Fort William. The castle was built in the 14th century, and restored in the 20th. Monty Python fans will recognise it as Castle Aaaargh from The Holy Grail.
FRENCH GUARD: Allo, dappy English k-niggets and Monsieur Arthur King, who has the brain of a duck, you know. So, we French fellows outwit you a second time!
ARTHUR: How dare you profane this place with your presence! I command you, in the name of the Knights of Camelot, to open the doors of this sacred castle, to which God Himself has guided us!
Monty Python and the Holy Grail