[Phantasm]

For my Ranoc fantasy setting, i have:

6 Elemental planes (Earth, Air, Fire, Water, Metal, Wood)
Astral Plane - Inner and Outer
Wandering Mountains - home of the main pantheon
Sylvania - the home of the goddess of the hunt, an infinite disk surrounding the Wandering Mountains
Great Wastes - land of the dead for the desert pantheon; at center is the Great Oasis where the desert pantheon dwell with the faithful dead
Thanatollis - land of the dead for the main pantheon
Ylcor - land of torment for the evil dead
Dyval - land of demons
Gloom Hollow - home of the main pantheon's renegade gods
Whickersnee - home of the plains-dwelling horse pantheon



If operating in D&D-Land:

Material Plane
Ethereal Plane
Shadow Plane
Positive and Negative Energy Planes
Elemental Planes (Earth, Air, Fire, Water)
Upper Planes (Good-aligned deific planes)
Lower Planes (Evil-aligned deific planes)
Astral Plane



For my Marvel Reboot project:

Asgardian Nine Worlds (Asgard, Vanaheim, Alfheim, Nidavallir, Svartalfheim, Nifflheim/Hel, Muspelheim, Jotunheim)
Mount Olympus
Astral Plane (Inner and Outer)
Dark Dimension
Heliopolis (home of the Egyptian gods)
Satan's Hell
Mephisto's Hell
Satannish's Hell
Microverse
Limbo (Immotus's timeless/time-travel realm)
many other possible deific realms and hells
many possible alternate timelines (honestly, the ideas put forth in GURPS Casey and Andy for messing with alternate timelines works nicely for Marvel)