I'm haunted by an idea

At one of our semi-regular raucous family gatherings on the weekend, there was discussion of the possibility of a sleep-over at a well-known and very bloody location in Canadian history (details under wraps for now).  I blame the vodka for the fact that it didn't really occur to me until the following day that such locations would make for really interesting studies of connections between feelings and place.  Anyone have suggestions for places I could visit?  I don't mind travelling around a bit.