I recently worked a double shift at my job, a maximum security psychiatric facility in California. At the end of a long day, I was sitting in the nursing station with another psych tech (orderly) just winding up the swing shift. She mentioned that the last time she had worked that same unit, EB 12, she had been sitting in what we call the Big Dayhall around the same time of the evening, when suddenly a woman in a floaty white dress came in the door, walked up to the television, turned around and just disappeared. She had no facial features that this staff observed, but it also happened very quickly.
The door had been locked up for the night and the patients had all gone to bed for the evening.
The staff had been so upset that she immediately left the room to go sit in the office. She stated that she has never seen any kind of apparition before in her life. According to hospital lore, the EB Building is reputed to be very haunted, most notoriously by a janitor who worked his entire career there before passing away, and is said to give directions only at night to unwary staff members who, unfamiliar with the labyrinthine old building, can become disoriented on their way to their assigned unit. Upon reaching their assignment, they mention the kind janitor who directed them, only to be told that there is no night janitorial staff at all and they have just encountered the famous EB Building spirit.
This building is notorious for numerous suicides and hauntings and there was once a morgue in the basement I believe. Once, I worked overnight in a room that I was told had been the operating room where many lobotomies had been forced on the hapless inmates of decades ago. I have never experienced any supernatural events myself, but it can be creepy in that old place for sure.
In the building I worked in for over 15 years, the N-Bldg, there was an old elevator that used to go up and down by itself frequently. It was worked on and rarely does it anymore. Electrical malfunction? Staff has reported ghosts in that area as well.