Yes, heaven and hell exist. Both exist on the plane that we exist. We constantly choose between one or the other. Heaven is a state of happiness and is called "Chardi kala".
But then, what is happiness really??
Happiness.It isn't always fulfillment of your goals.It isn't always acquisition of your dreams.It can be the simplest of things.Happiness can be a glimpse of the stars through the clouds.Happiness can be a patch of sunlight in the forest.Happiness can be the most unexpected and out of place thing in the universe.And that is what makes it so brilliant.Happiness is the smile of someone you love.Happiness is knowing that everything will go right, even just for a second.Happiness is the realisation that you are not alone in this world.And happiness is helping someone else to realise this too.Happiness isn't just a reaction to certain stimuli.It is an attitude, a mode in which to put yourself.It is a state of bliss, not ignorance nor defiance of all that is evil, but understanding that there is no such thing.More than anything else though, happiness is the purest and most spectacular light shining from every hole in your body, and it shines onto anyone around you, rays of brilliance and joy.So be happy, and spread the light, because sooner or later, it will be dark, and you had better hope someone has a light. And it will shine. It always does.
The Guru's, Shaeeds, bhagats and countless others lived in the eternal state of 'Chardi Kala'. We can consider ourselves blessed if we can find a brief and spordic visit to 'heaven', away from the hell we lovingly dwell in, lol.