Quantum Realm (Earth-6531)

The Quantum Realm is an alternate universe in the Multiverse, where time and space do not exist and everything exists only in subatomic levels. It can only be accessed though magical energy, or through severe subatomic shrinking via the Pym Particles.

History
One of the realities in the Multiverse, the Quantum Realm would only be accessed by a being in 1961, when Doctor Hank Pym discovered the Pym Particles and witnessed their ability to alter the size of objects and organisms.