the glass elevator of the three natural bridges within wulong karst national geology park in china.

glass elevator gorge valley ravine high height vertical erect wulong karst geology park chongqing china asia three natural bridge unesco world heritage rock stone landscape landmark famous place travel destination destinations trip tour tourism tourist attraction outdoor outdoors outstanding interesting attractive geological nature scenery scene view layered format formation formations procession surface texture pattern strong strength phenomenon spectacle geo geography eco ecology limestone background blur