We went into an abandoned mental institute before, it was a shell. Freaky shit tbh. It had a km long corridor that'd give you nightmares. But there was a building behind it which was sealed up with metal sheets, so of course we had to go in. The stuff we found in there was unreal. I fell through the wooden floorboards so really not structurally sound. We found all old art projects by patients made with shells and pasta, mosaics, old catholic statues with bits missing, tons of pictures of Jesus. Old perscription presses still filled, massive vats, weird chairs, beds, etc. The only thing I took was the Lenten covenant from 1913. About 2 weeks later that whole area went on fire and everything was destroyed. Will post pics later.
Once at a coastal area I found this real trippy rock, I looked it up and the closest thing to it was a meteorite. It's about this size of your fist.
And another time I found this big old stone that was clearly hollowed out by hand. Still haven't figured out what it is though