the concept of heaven is as an opposite to the concept of hell. one is all-good and tother all-bad. so you can see that this is a dualistic thang
pagans had though the belief in a RESTING place inbetwixt life and death...Summerland, the Land of Faerie, etc, where one wold be till being reborn on earth
the abrahamic religions tend to split 'good' from 'bad' and have no openness for spiral continuum, ie., cylic Nature, so they devize PERManent 'heavens' and 'hells'. for example, Islam has the garden where the 'MSLE' goes and is 'looked after' by 70 virgins etc etc.....and for christians being a bit....( a BIT?) more puritanical enviasges a sexless heaven. and both have everlasting hells fo unlbelievers
THe best place is right here, which is the depthless realm of good AND bad