phong nha ke national park / vietnam, 16/11/2017: man with headlight standing on a rock under a high wall with stalactites inside

16112017 adventure asia bang beauty black caing cave cavern chamber dark exciting experience exploration explore giant hang headlight high inside jungle light man mountain national nha nhake outdoor oxalis park phong rainforest river rock scramble shadow southeast spectacular stalactite stalactites stalagmite standing thrill tien tour tourism tourist travel trip under undergound vietnam wall water