I used to work in a nursing home as an evening receptionist. One autumn evening, around 7:30 pm, some of the nurses had finished their shifts and were waiting for rides home. One nurse stopped to talk to me and then she was distracted. She asked me why the front entrance doors were opening if no one was there.
Now, I can't see the main entrance directly from my desk. There's a pillar in the way. On another pillar there is camera that points directly at the door and the monitor is on my desk so I can see the door in black and white. There's a button outside that someone can press to make the doors open. I looked at the monitor while the nurse leaned back to look at the door.
I clearly saw a little, old man with a cane and wearing a baseball hat coming in though the first door. I didn't answer the nurse because I thought she'd see him and answer her own question but she leaned back over to me and said that was weird. No one was there.
I could see him so well on the monitor. I stood up and came around the desk where she was to look outside and I just saw the doors closing on their own. No old man. I told her about what I just saw but she was just ready to go home and not even listening to me anymore. That was okay because I didn't really want to say it again. That was just crazy. I'd just seen a ghost in well-lit lobby with three other people around who didn't see anything.
Since then I've heard lots of ghost stories about the nursing home. It's a fairly new building but I guess it's already acquiring some ghosts.