Ancient texts says ” heaven is within you”, and what they're talking about is the frequency of your being. When you leave your human body, you are automaticallyon the highest frequency of pure love, because that's the frequency of your being. In ancient times this highest frequency of pure love was called heaven.
But heaven is for you to find here in this lifetime- not when your body dies. You are to find heaven here, while you're on Earth. And indeed heaven is within you, because heaven is the frequency of your being. To find heaven on Earth is to live your life at the same frequency as your being- pure love and joy.