There are two towers within a reasonable walking distance of one another. One of them is about 6 storey's high (if I'm counting the stairs and not the levels.) and smaller than the other structure which is about the same height. I was able to renovate and furnish both of them. The larger structure needed more work to make it liveable though and it got half demolished by a troll ( I eventually got rid of the troll.) and rebuilt it replacing every missing rock with floor, wall and ceiling made from wood. The upper levels were still intact and it merely needed me to rebuild the adjoining stair ladder for me to have access to those upper levels where I kept the valuables in a chest. It looks very strange now, like a stone tower with a wooden building at it's ground level. Before I got to it there were three or four skeletons defending the place and they haven't re-spawned, but there is another troll nearby. The other tower had only one skeleton.