beautiful view of gold sunlight shining through sung sot cave or surprise grotto on bo hon island is one of finest and grottoes

activity and area asia attraction bay beautiful cave ceiling center chamber colorful destination experience finest floor formation geological geology gold golden grotto grottoes halong hanoi heritage hon island landscape light limestone long national natural nature one rock scene shining sightseeing situated sot stalactite stalagmite stone sun sung sunlight surprise through tour tourism tourist travel trip unesco vacation vietnam view visit widest world