Where are some haunted locations in central PA that are real(have historical truth behind them)?

I live in Altoona,PA and have visited many places around here...like the lost children of the alleghenies monument, the seven gates of hell in york pa, the real silent hill in centralia pa, etc. I was just wondering if anyone had some not well knwn places to check out that wouldnt be too too far. Thanx ppl