Sort:  

Look into the kabbalah, the free-masonic order, Illuminati, new world order and so on...
("Freeman Fly" among others on Youtube talks about these topics)
Parts of those groups seem to engage in demonic rituals (including human sacrifices of virgin women and children) with the purpose of calling forth evil entities from other realms that then would benefit them.
One of the perks ought to be greater insight into the world as it is (present) and can/will be (the future).
As you can imagine not much of this theory can be proven...

Nowadays proof for most people is just a high enough % of other people believing the same thing. Kind of like the proofs for gravity, aliens, dinosaurs....

I’ve read from multiple sources about a device or project called Looking Glass. Maybe this has something to do with it.

Read Manly P halls book: Secret teachings of all ages, and the Companion guide: Lectures of ancient Philosophy. You may then understand.

Many "awakened" people are aware that consciousness is non-local. This allows our intentions to affect the world, such as the Princeton study shows reproducible and with greater weight as more people focus their intentions. http://noosphere.princeton.edu

With that in mind, time may serve as little of a barrier as space, allowing remote viewing, even in the past or the future.