In our excursion to Alcatraz I managed to snap a picture that contained an "orb". I am skeptical of orbs since they can manifest from dust particles, light, etc. What leaves me questioning this one is the fact that I did not see any other orbs in any of the other photographs while I was at the old prison. The place is not a dusty old cavern of a prison, but I guess dust particles could appear just about anywhere. This shot is taken in the old Dining Hall.