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Originally Posted by (E)
In the first catagory
The four Elemental planes
Morcock style infinite realities.
Hyperspace
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AD&D had 9 alignment planes to start with, then however many others.
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GURPS
Hell (or where ever demons come from)
Afterlife realms, where spirits of the dead reside.
Extra dimensional space from bigger on the inside spells
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Psionic Powers details the Inner and Outer Astral Planes.