The Dark Zone

The Dark Zone is not a particularly fun place. It's full of evil, demons, damned souls... more evil. It was created at the beginning of time when The Oracle accidentally caused the Big Bang. It's influence is enough to instantly corrupt the purest soul.

Vincent Benedict accidentally teleported himself to the Dark Zone via a teleporter and became the evil overlord of it, harnessing it's power to create his Apothicon and Cryptid army. This of course only happened in Timeline Chaos (the Apothicon and Cryptid part anyways. He's still evil in all timelines).

The Dark Zone can only be entered via a teleporter powered by Element 115. When using a teleporter, one can temporally see the zone (the picture up there is what most see) despite not choosing to travel there.

Trivia
 * The pure hateful energy that makes up the zone is enough to completey destroy the purest things. The Matrix of Benedict is an example. Well, the Matrix of Timeline Chaos to be more exact.