The Pillar of Virtue
This towering spire rising out of the center of Pandora is the home of the wizard Lemegeton. Though it appears an ordinary enough tower from the outside, inside it is like another dimension. One can end up all the way at the top without ever climbing a single stair, and the same door can lead to totally different places each time you pass through it. Nobody who has entered it (and returned alive) has reported seeing the same things as anyone else.
Some explain this by claiming that the spire itself is a living organism, morphing its shape according to Lemegeton’s will. Still others contend that the tower extends into other dimensional planes and that the sheer number of different rooms and their complicated connectivity cannot be understood in terms of simple three dimensional geometry. Only Lemegeton knows the real truth.