The Father is so great that to see Him would mean death. If a camera survived snapping His picture, the picture would, at best, be pure white.
You and no one have ever seen the "father" and even though they have never seen the "father", they make the assumption that the father is very big, so big that not even a camera could take the photo?
You can check the dictionaries and encyclopedias for the answer. However, The Heaven of heavens is outside of this universe, so neither of us would understand the coordinates.
Basically you do not have proof of the existence of heaven
Actually, it is you who have been brainwashed.
Do you believe in an imaginary man and say I was brainwashed?
Nope!
