The title is clickbait; this thing is about 20 minutes north of Seoul. I posted about it in a recent thread, and went back for a closer look.
1. I approached the site from a different side, finding a traditional gate.
2. Taking a wild guess this is a decoy security feature. I doubt screws go in there.
3. The gate itself was the security flaw. Turning around, I could see how the ledge extends around the wall, making it easy to just go out a bit and get to a low part on the wall.
4. Once inside, I saw what looked like a modern house in front of a large traditional building. I was worried the house might be inhabited.
5. Rather than going through the property, I climbed the mountain slope behind where I could get a better view of the site and avoid trespassing allegations if it was inhabited. Looks not.
6. Behind the house was a traditional-looking compound surrounded by a pond.
7. Under the boulder is a tap for collecting springwater.
8. You can see the pond here, as well as a corner of the largest building which I never approached.
9. It's a traditional building but the windows aren't.
10. This is the terrain I was going over. Sloped, and covered with just enough green you couldn't see the ground underneath.
11. Slightly less fairy-tale-like settings.
12. There's the train. A friend identified this as a "Chinese Class C2 0-8-0 narrow-gauge locomotive." According to
this site, they originated in Russia.
13. Seen up close from the other side.
14. Another look at the symbol. "This is a variant of the old Chinese National Railway logo. This was used for any railway vehicles that went back and forth between China and North Korea, or any railway vehicles used in the Korean Autonomous Region."
15. In front of one of the other buildings.
16. I went into the concrete shell to get this picture.
17. After that, I started to get more daring with the other buildings, but I heard what sounded like a door slam so I bolted. That white car is parked in a suspicious place out front, making me wonder if a property owner was responding to a silent alarm.
18. Here's the front gate showing a bit of the main building.
Still trying to determine if this is a find of any particular significance. I'm sure there are plenty still on display in museums and parks, but want to know the story of this one. So far, no more identifying information has been found.