I can imagine some shapes like this in theory, I just think we can rule them out in practice. For the hole example, we know there aren't any holes 500 km deep.

I can imagine some shapes like this in theory, I just think we can rule them out in practice. For the hole example, we know there aren't any holes 500 km deep. For the pyramids, we know the line of sight is very close to flat (it's at least 500 km long and less than 10 km in elevation change). If a false peak prevents you from seeing the real peak, the angle of the mountain above the false peak is shallow enough that you can call it a plateau.