I was being lowered down a well or a hole in the ground with two other people. It was some kind of archeological dig, or it felt like it was. The well was maybe 4 feet in diameter and its walls were curiously grime-free, and dry. As we went deeper, the wall changed from your typical well wall into something else, becoming covered with wood panels and drawers and little doors and nooks and crannies complete with the occasional lampshade and potted plant. I opened one door and it was filled with books. The whole well became a well of books of all kinds and ages. We reached the bottom and I found a relatively new flyer for a show or an advertisement for an upcoming movie. I concluded to the other two that it was probably still being used by whoever built it and we were, therefore, trespassing.