If you seek in oldest religion you will get you answers . HINDU knows multiple universes are there and multiple types of world's are present which are not made up of material things like air,water,fire,earth,and sky. Spiritual worlds.To get there we have to be spiritual in this human life only . If you go deeper there is philosophy of soul and body in Hindu religion Soul is immortal and changes bodies from one body to another body sometimes human sometimes animals depends on karma.if you break the cycle of karma means no next birth then you shall be liberated and go to the spiritual worlds