These are some underground tunnels where cables or pipes used to run, and I’m also adding photos of what looks like a waterworks—I’m not exactly sure what it was, but since they’re pretty close together, I’ll put them in the same album.

Abandoned building. There's basically nothing interesting all three floors are just one long corridor with columns and you can't even climb to the roof but there is an underground but we didn't manage to explore it and we were scared because we were there in the dark.

It's a huge abandoned heating plant with a lot of equipment left.

Abandoned hazardous waste incinerator. It's quite difficult to get there because it's boarded up and where it's not boarded up there's glass (my friend cut his knee when leaving) and also watch out for the police, they say there are photo traps but we didn't see any and sometimes the police go there to train dogs so watch out for that.

It's semi-deserted and there's a building in the back that's probably still functional and maybe there are cameras but when you enter the area there's one building you can climb into and you can also get to the roof but the ladder is pretty overgrown. But there's a second building, and you can climb that without any problem.

Abandoned school that someone wanted to renovate but obviously didn't finish it, probably ran out of money so it's falling into disrepair (watch out, someone probably lives/stayed on the ground floor)