I also loved this:
3.5e: Well there is material realm, and the astral plane and (this other thing I forget). The astral plane is a bunch of grey nothingness with occasional stuff in it. Also, the other planes are just full of dirt, and air, and fire, and whatever.
4e: There is the Feywild which is a realm of chaotic beauty, and like a jungle run completely wild in ways a mortal mind can't actually really comprehend. Just being here is going to drive you a bit mad. Also there is the Shadowfell, with grim winding caves that defy physical law, whose impossible geometries will turn people mad -…