This is the home of twins, Daston and NAME Danal in the Lu'shun Republic. It's based on a real-life castle called Borrekens Castle in Belgium, though the Danal version is decked in their iron butterfly crest and does not have a moat like the real thing. The Danal Estate is also considerably smaller than the real world castle, and is set up more like an extravagant manor home from the 1700s English countryside than a medieval castle.
That being said, it's still big, spooky, and the perfect home for a pair of outlander Clanspeople living in the Republic.