How did you get this fascination with abandoned buildings? Or tunnels? Or anything?
Back in the 80's when I was a tween/teen and then it was just me "Going into empty old buildings and cool looking places I wasn't allowed to go into". It was a couple of decades before digital photography and even the phrase urban exploring, or the internet existed. So lot's of interesting stuff I saw but did not document.
Oswestry, Shropshire. Cambrian Railworks there were surface level air raid shelters, three of them remaining on waste ground. We would spend a couple of weekends digging through the thin soil on the top until we could lift off one of the capstones and get inside. Nothing inside, but for a kid it was exciting to just get in not one, but all three. Council eventually bulldozed all of them once we had opened them up.
My secondary school at the weekend, you could go anywhere (Outside) and the only thing you needed to watch out for was the caretaker who lived on the bungalow onsite but he only cleared us off once. Getting onto the roof to collect all the WW2 polystyrene toy planes, Tennis balls and footballs that had been lost up there being a highlight. No security, no cameras back then.
Some asylum/hospital place just outside the town, massive building lots of rooms. Found someones "Secret wanking dungeon" with a lot of porn mags and an old mattress on the floor in one of the small rooms on the 3rd floor. There was also a church out the back with a crypt, whole place was smashed up.
Oswestry being on the border of Wales meant a reasonable bike ride away there were many many abandoned farmhouses and cottages tucked away.
Cambrian Railway restoration yard, couple of small locos you could clamber around on when there was nobody around. Which most times being an underfunded volunteer project was most of the time.
Oswestry ROC post, I learned what theses were years later on this site. We spent a few hours chipping away at the concrete holding the hatch in place until we could push it off. We thought it was another bomb shelter. Nothing inside at all, few inches of smelly water inside. Council came along and capped the whole thing off with concrete not long after.
Then I moved to Milton Keynes, which isn't a hotbed of urban exploring even back in the 90's.
Wolverton Rail works, big not much inside. BUT back then the Royal train was still in storage there. I didn't know what it was at the time and thought it was The Orient Express! I just walked up the length of it in it's shed but didn't go inside. This one is by biggest miss of not being able to document in hindsight.
Not much else in this time period, few empty houses and nothing else because Milton Keynes is sterile. However if anyone want's/can do The Point I can give some guidance on the internals of that building as I worked there for a few years. I don't know if they demolished it yet.
Moved to China mid 2000's, loads of stuff to find and I've documented that. So take a look at my reports for a lot of the stuff I've seen here.