inside thien cung cave that decorated with artificial colourful lights at ha long bay. quang ninh, vietnam

and artificial asia attraction background bay beautiful beauty blue boat cave cliff color colourful cung dau decorated destination geological green grotto halong heritage indochina inside island landscape light lights limestone long many mountain natural nature ninh palace quang rock scenic sea seascape site sky southeast stalactite stone that thien tour tourism travel tropic unesco vietnam view water world yellow