Ok, I just returned home from 5 days at Gettysburg with my dad. On the last full day, Wednesday the 23rd around 7:30 we decided to go look for the 40th New York Infantry monument before the campfire program on Dan Sickles. We parked at the Devil's Den parking lot and walked over to monument. I have been to DD numerous times with nothing really odd occurring. This time was very different. I felt very uneasy as soon as we got out of the vehicle and began our walk to where the monument is located. At one point my dad asked me what's wrong, apparently I was extremely white and looking shaken or upset, when he spoke it kind of broke me out of a weird trance or something and literally every hair was standing on end, I held my arms up to show my dad. The tempature had dropped after a thunderstorm rolled through to I think around 81, it was 97 with the heat index before the rain, but I was freezing. I joked must be ghosts to break the odd tension and after that everything was fine, no longer freezing cold and goosebumps vanished. I have no idea what happened or why, very odd and honestly a disturbing experience. I am chalking it up to my own imagination...(I hope that's all it was).