"Has anyone ever visited a location that had a really bad feeling for them?"
I'm sure this has nothing to do with a past life, but when I visited the AIDS memorial at San Francisco's Golden Gate park, I felt physically overcome with grief, and I don't personally know anyone who ever died of AIDS. I must have been picking up on other people's vibes.
That's one problem I have with reincarnation memories in general ... how do you know if you're picking up on strong energies that are outside of your own personal experience, or experiencing something that actually happened to you on an individual soul level?