Hang Dau Go, Hidden Timber Cave, Halong Bay, Vietnam, Southeast Asia

asia asian attraction attractions bay cave cave caves chalk colored colorful coloured colourful dau different different colored different coloured dripstone dripstones east famous go halong hang hidden illuminated illumination illuminations inboard indoor indoors inside interior internal known lighting lime limestone lit multi multi colored multi coloured nobody photo renowned seeing sight sights site sites south south east southeast stalactite stalactites stone timber tourist up vietnam vietnamese view views well well known worth