The native people of Mountain Province buried the remain of their love ones by hanging them along the cave.
It was said that the hanging coffins could prevent bodies from being taken by beasts and also bless the soul eternally.
It is their traditions and belief that the soul of their love ones will go to heaven if they hang in the cave the coffin. Now it is open for the tourist to see the coffin and experience mountain climbing as well, its a nice experience to get there.
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From @yolly