Fort I is not as interesting as an atmospheric place. As for me, walking through the casemates is not particularly interesting, but this is a rare case when there are not much ruins on the site, but also not much graffiti, etc. It has three corridors with rooms in which wiring remains, and three hills near the fort also belong to it. There will be a DOT at the end. The only way to get into it is to crawl through the gap before going through the boards that are kept on a good word. Honestly, it's not worth it. All possible entrances are closed with a fence, so the only one remaining is through the gate to which the path from the road leads.
The place is gorgeous, quiet, historical. But everything is very overgrown. It is necessary to keep a better eye on historical monuments! For those interested, I boldly recommend visiting this place.