The Fourth Dimension

The Fourth Dimension is a mysterious dimension of oddity. It exists further in time than real-life itself, and the third-dimension real-life is classed in. Many scientists on Earth have researched about it, and countless humans have tried to access it, but many people believe it won't be possible for centuries.

In some cases, it is known as The Void.

Information
The Fourth Dimension's geography is astonishingly mysterious; unbeknownst to the humans of the third dimension. Its physical appearance is indeed strange, to the likes of things that no human can imagine.

As the third-dimension and the Earth go forward in time, enigmatic beings watch from the Fourth Dimension, and beyond.

The only thing from the dimension known to humans is the 4D Hypercube.

Other Info
At the time the Fourth Dimension was found and known to have existed at all is the time that humans have created Time Machines.

Finally, by the year of 4510, the Fourth Dimension became accessible. However, the humans had previously abandoned Earth to retreat to the stars, because of overpopulation; as a result, they never knew of the access to the Fourth Dimension.