In May of 2011 me, my parents, cousins, uncles, aunts, all went to the The Outer Banks in North Carolina. We rented a really nice 3 story beach house that was very active with ghosts. The house was no more than 20 years old, and we weren't told of anything other than right before we left for our vacation we were told the owner was recently hospitalized and we had to go through a Rental Company because the owner was unable to make the arrangements.
The activity didn't start immediately. 2 or 3 days after we got there my aunt (Holly) came out of the house from the bathroom, and said "who did it". We all looked at her dumbfounded. She said "who knocked on the window?". The window was right around the corner from where we were sitting outside, but we had all stayed in the same place as we had been when she left, and we would have seen if someone else did it. So this was only the beginning.
The 3rd floor was the kitchen, living room, dining room, 2 bathrooms, a bedroom and a widows watch. I was sleeping in the living room and the hallway to the bedroom and bathroom was making creaking and groaning sounds, like the floor boards were loose and someone was walking on them. But I walked over there and no such noise was to be heard, not even a little squeak. I jumped up and down but I just couldn't re-create the noise. I was terrified to sleep so I laid awake for awhile hearing the noises frequently. And it only happened when I was alone.
The widows watch was the scariest though. There was a wild fire not far from us, so the air was smokey and heavy, and the widows watch didn't have A/C. The air was still, no wind, and I was trying to enjoy my solitude, but a heavy, and eerie presence was making me uneasy. There was only 2 swivel chairs and a table with a lamp. I sat alone in one of the chairs when this rush of cold overcame me and the chair looked as if someone is sitting in it, and began to rock and sway back and fourth. I opened the door, turned off the light and ran down the stairs as fast as I could.
What I believe is that the owner passed away and had come to claim his property, all I know is I have never been exposed to that much ghost activity, ever.