Where is heaven? It's not so much a literal location as it is a level of consciousness. It is something which can be accessed here and now, just like tuning to a different channel on TV.
Heaven is not just a place that we go when we die, but also a place that we can bring down to earth.
By raising our consciousness high enough, we become the channels through which heaven can be made manifest on earth.
Just like how the whole world looks different depending on whether we are depressed or are in love, our whole world is different when we attune ourselves to the heaven within.
Just like changing the channel on a TV by tuning it to another frequency, when we raise our own level of consciousness so that we attune to heaven, we experience heaven right here on earth!
The Kingdom of God is within you! The Kingdom of God is at hand!