Kind of depressing how much of an industry is built up around this. Even with all the emphasis on "respect" and "sensibility", it still feels like profiting off of tragedy.
I would like to add one more thing. Remember about decent clothing. Cover your shoulder, knees, belly, back. And check if you have anything on your cloth. Some pictures or inscriptions are just mistmatched
Information is quite different on all of the websites about visiting. I hope when I go there in 2 days I won't encounter any issues :(. I'm going without a tour.