Interesting, and surprising as well. I see what clearly looks like water under the two white lights situated roughly in the center of the photo, and reflections of those lights on that water. What I don't see is a grave or graves. Is this a cemetery with above ground tombstones or a memorial garden with ground level grave markers? Understand I'm not questioning what you believe you see, I'm trying to set in my own mind the "lay of the land" in the photo for which you've asked opinions. Any chance you could take a photo of the exact same location in the daylight and post it here?