There's a mythical place in the world called Shangri La that people believe in its existence as "Heaven". You'll have to bet your life if you are desperate to get there by floating on a boat through a long, dark cave. It'll depend on your strength, valiancy and enough luck that you'll preserve your life and more precious than any treasure on Earth, you've stepped on the Land of Heaven.
This realm is where you can breath the purest air, drink the freshest water and meet the prehistory creatures and plants that you'll never find anywhere else on Earth. Moreover, you'll able to see the most ancient temples and artifacts were that abandoned for more than thousand years. But don't let your greed lures you, unless you'll never have a chance to come back home by taking anything belong to this realm away.