Here are some photos of uncovered secret cave from upper mustang , Nepal.
There are around 10000 collection of man made caves dug into side of the valley in mustang district. No one know what was the purpose of making that cave and who ordered it
View from inside the cave
Most Of the people say it looks like a big sand castle and when you'r about to climb up there it feels like everything will collapse in minute. So, Trek on this area is adventurous as well as thrilling
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From @archu