In Devon UK there are many castles and forts ranging from Iron Age through Medieval to this very late pastiche known as Castle Drogo which
was built in the 1910s and 1920s for Julius Drewe to designs by architect Edwin Lutyens. Obviously it's not a real military fortification but it has an interesting style and a fabulous location. It's currently undergoing some major re-roofing work for the next few years and is covered in massive scaffolding with most of the interior treasures packed away. They don't mention this on the website; so you've been warned.
I drew this before they started work. It was purely an exercise in accurate measurement and fun to do.