I worked security for a very old courthouse built in the late 1800's. They added on to the old courthouse but the center is the original building. Things happened all the time. You walk by a vending machine and candy or soda would just fall out... I was afraid to eat to it at first b.c the sheriff's officers said they get angry if you touch their food.
Theyhad an office in the building and they always talk about hearing things. Walking around and the elevator doors would just open and close as you walked by. Hearing footsteps and not knowing if it's a sheriff's officer or... Nothing around the corner, wtf.
So creepy I still think about it every time someone mentions ghosts. I hated that job for that and the spiders everywhere you had to punch a punch card to make sure you were at that area.