It is an imposing, massive castle on top of a high hill. Worth a visit!
Here's the website and the wikipedia article.
As my friend Mark pointed out the entrance arrangements are a great example of defense in depth, or perhaps even about paranoia... there's multiple doors, multiple layers, always positions to shoot down on an advancing attacker. Nicely done. Very nice to look at, too.
Read more urban exploration stories from theurbanexplorer.net, and other underground stories from planetcaver.net. Read the full Planetskier series at planetskier.net, or all blog articles from Blogspot or TGR. Photos and text (c) 2023 by Jari Arkko. All rights reserved.