Limbo
Ruled By: Immortus
This dimension is unique in that it exists outside the time-stream and thus possesses no time. Reality in Limbo is comprised of a single, ever-changing moment in which everything that ever was, is, and could be co-exist. Human beings within Limbo might imagine that time passes there, since they are conditioned to think in such a way, but they cannot age or die there. In order to time travel without aging, it is necessary to pass through Limbo.
Time travel can be accomplished by either technological (as with Reed Richards, Doctor Doom, Immortus, and Kang the Conqueror) or magical means (used by Clea, Doctor Strange, and Dormammu). Since magic uses energies not available to science. it is possible that magical time travel differs in some significant respect; however, the full mysteries of time travel have yet to be revealed.