Hello. I've been reading these stories for a while now, and I suppose it's time to share one of mine. This isn't my first experience, nor is it my most recent. Some of it is second-hand, but from a reliable source. Enjoy!
Quite a few years ago, I took a job working at a casino in Colorado. The area was considered a historical district, and many of the buildings had an "Old West" theme. Casinos were considered part of the history too. By itself, that tiny little town has a bit of a reputation for haunting - there's an old cemetery at the top of the hill, and there were many gruesome gold mine accidents. The old west was not a gentle place.
Anyway, I worked as a cashier, and after a few months I started hearing some stories about the building I worked in. The cocktail waitresses mentioned certain cold spots, especially in the basement, and nowhere near vents or other obvious things. There were random power outages. While power outages aren't uncommon in the mountains, they don't often happen in clear, warm weather.
Once in a while a few of us would wander over to another casino. It had the only room in town with only built-in table slot machines, and no one played them. It was sort of the casino-workers' bar. We could drink there in peace, without the constant ringing and flashing lights of our workday. Over time I struck up a friendship with a few of the security guards. They were about twenty years older than me, and mostly former military men. One night one of them started talking...
Every casino has tons of security cameras mounted into the ceiling. In the cashier cage alone, I counted forty of them. There are people up in a little room watching the live feeds all day, making sure no one cheats and that no minors sneak inside. He was walking around, not long after the casino opened, when the surveillance (the "eye in the sky") radioed him. They said there was a child walking around near the front door on the first floor. He took off to catch her. Not even children are allowed in the casinos, and if the gaming commission caught one, the casino would be fined some huge amount. He got to the first floor, walked around, and radioed back that he didn't see any kids.
Surveillance said she was there - a little girl, with a yellow balloon. He was standing RIGHT NEXT TO HER, yet couldn't see her. He was pretty shaken, and not long after, the girl disappeared.
My friend didn't want to talk much about it, when I asked, even when I offered to buy another pitcher of beer. I asked what she looked like, and he didn't know. I asked if surveillance had saved the tape - and there he got really dodgy. He said the tape had been destroyed, taped over. I was horrified. He said that the managers didn't want that kind of publicity for the casino. They thought it would scare people off. (As I got to know the managers, I could tell they were the kind of people who would do that)
I talked to a couple other coworkers who'd been working there that long, and they corroborated his story. Weird things continued to happen there, now and again, as well as other casinos up and down the street.
I haven't been back since I moved, but I suspect they still go on, perhaps even more so since they did some modest remodeling. Several other new casinos moved into the area as well - I have no idea if they have problems today.