I'm a pretty logical person, and don't much believe in ghosts and such, but will readily admit that I don't know everything.
I've had only one "supernatural" experience in my life, in 1982 I was travelling with a group of scuba divers to our annual Easter dive at Lake Chiemsee in Germany, in a convoy, and had taken a scenic route down from Mannheim. I was riding in the equipment van with Joe, the head instructor and founder of the Mannheim American Scuba Club. While heading down a pretty non-descript stretch of road through the countryside not far from Munich I suddenly felt extremely uneasy, to the point that I got my sidearm out of my bag and confirmed it was loaded (wasted effort, it was always loaded). Joe kind of chuckled and asked me what was wrong, so I told him that I didn't know, but that something was "bad wrong".
He pointed at a fence on the other side of a field we were passing and said "That's Dachau".
If there are ghosts, Tuesday will see the largest gathering of them in human history in Washington; there will be millions on millions who wouldn't miss what will take place at Noon. Front-row seats will be occupied by Frederick Douglas and Abe Lincoln and Harriet Beecher Stowe and Martin King, but they will be backed by nine or ten generations of those less well known but no less interested.
If I had any artistic ability I would add them to the first available picture of the visible crowd on Tuesday. Lacking such ability I'll at least give them a thought, just in case.