Asia, Vietnam, Halong Bay, Halong, Sung Sot Cave, Surprise Cave, Cave, Caves, Stalaktite, Stalagmite, UNESCO, UNESCO World Herit

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Photo credit: © Vidler Steve / Alamy / Afripics
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Keywords: asia, bay, cave, caves, halong, heritage, holiday, sites, sot, stalagmite, stalaktite, sung, surprise, tourism, travel, unesco, vacation, vietnam, world