Okay this isn't paranormal, just weird. When I was about 10 maybe a little younger, my family and I went to stay with some family friends up north somewhere, I forget where. These friends had just moved into a huge old house, which they were having some work done on. I loved exploring that old house. One day I was running around the outside of the house, playing with some other children. Along one side the house was virtually overgrown with ivy and tall bushes which I crept into to hide. I remember the wall feeling very cold and I looked up and saw a tiny window, far too high to reach, all grimy and dirty, set high up on the wall, hidden from view by the tall bushes and foliage growing up that side of the house. Anyway, running in and out and around the house I pretty quickly got used to all the nooks and crannies of the place, and loved it. But something nagged me about this little window you couldn't see from the outside. And then I realised you couldn't see it from the inside either. I had crawled all over that old house and never got to a place inside which corresponded with that tiny window. I mentioned it one morning and none of the owners of the house had seen it. I took them behind the bushes and pointed up at the tiny window, and they traced the wall around and we came to the kitchen. They determined that there must be some kind of hidden chamber behind the kitchen wall. Now they planned to completely redesign the kitchen anyway. And the owner of the house decided he would use a sledgehammer to break through the rear wall of the kitchen, where he thought this chamber might be, and open it up. I remember watching excitedly as he set about smashing into the rear wall of the kitchen with a massive hammer. It took some time but after awhile he'd dislodged several bricks and began pulling them out until a reasonable hole had been made. We then peered in with a torch and saw this chamber. It was about twice the height of the kitchen, and comprised of an odd arrangement of walls at funny angles. More of a weird shaft than a room. High up on the outside wall was the tiny window, all grimy and dusty. But strangest of all was the fact that right in the middle of the floor of the chamber, was a tiny wooden, child's chair.