7) Radioactive Material
Whoever planned on digging here in the first place, they’re quite brave if not a bit foolish. This gravestone says, “do not dig – radioactive material from nuclear research. There is danger to visitors.” While this would pique our interest, it would also cause us to safely tiptoe around the area until we leave (via Bored Panda). We’re not really sure why anyone would want to be considering digging here if that is the case.