I was driving through the Sahara and there was a weathered building that looked like it had nearly been finished and then forgotten. It sort of felt like part of a pvp game. I slept overnight there so I didn't have to set up my tent.

In China, I rode my bike through entire towns that were completely built up and abandoned, including a 40-story fully furnished apartment building with a ridiculous gym and water features. It was demolished a couple months after i explored it

In Thailand I slept in this old temple that was totally overtaken with vines and brush. I was worried about snakes, but Buddha was like right there, so it was fine

In Hawaii there was this pillbox halfway through a mountain ridge hike. It was pretty locally famous and dull.

In Ireland, there were a bunch of abandoned houses on the road I walked down and when it rained too hard(every ten minutes or so, February in Ireland), I took refuge in them. They were missing walls and windows, but Ireland is so pretty they all felt like sacred sites instead of witch houses.

Oh I did find an abandoned building once taken over by hobos or teens and then reabandoned I guess, but it had needles and bottles and graffiti and I got real creepy feelings that around every corner or in the next room I'd find someone hunched over, biting their own tongue off or something.

I didn't though, so it was fine.