Answer:
I have cities with no people forests with no trees and oceans with no water.
I go through a door but never go in and never come out.
I am black within and red without With four corners round about.
I am flora not fauna. I am foliage not trees. I am shrubbery not grass.
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers magazines and journals.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.