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2. Hang Sơn Đoòng - Wikipedia

   en.wikipedia.org/wiki/Hang_Sơn_Đoòng

   In early August 2013, the first tourist group explored the cave on a guided tour at a cost of US$3,000 each. [17] ... "Hang Son Doong" (video on Vimeo). March 9, 2015

3. Vietnam’s Eighth Wonder of the World Revealed in ‘A ... - AOL

   www.aol.com/vietnam-eighth-wonder-world-revealed...

   Hang Son Doong, which translates as ‘mountain river cave’ is the largest cave passage in the world […] Vietnam’s Eighth Wonder of the World Revealed in ‘A Crack in the Mountain’: Watch ...

4. World's largest cave is so big you can fly a Boeing 747 ... - AOL

   www.aol.com/news/2016-12-14-worlds-largest-cave...

   Despite all of our recent advancements in technology, the Hang Son Doong cave in Vietnam was not even encountered until 1991, millions of years after its creation.

5. Hồ Khanh - Wikipedia

   en.wikipedia.org/wiki/Hồ_Khanh

   Sơn Đoòng cave doline. During the 1990s, Hồ Khanh was living as a very poor man, trying to earn an honest living in Bố Trạch.During a jungle expedition to extract agarwood in 1991, Hồ Khanh reportedly discovered an enormous cave entrance, with a wide river flowing out of it.

6. Talk:Hang Sơn Đoòng - Wikipedia

   en.wikipedia.org/wiki/Talk:Hang_Sơn_Đoòng

   From first few pages of Google search results on "Son Doong" (without the "Hang"), many give "Son Doong cave" (lower-case c), including high-quality sources like National Geographic , , Some include "Hang" anyway, in "Hang Son Doong" (including high-quality sources like Nat. Geo. again, and Smithsonian) [7] , [8] , [9] , as well as some travel ...

7. Why vacationing with my adult son is now my favorite way to ...

   www.aol.com/why-vacationing-adult-son-now...

   TourScoop covers guided group tours and tour operators, tour operator reviews, tour itinerary reviews and travel gear recommendations. This article originally appeared on USA TODAY: Traveling with ...

8. Hang Én - Wikipedia

   en.wikipedia.org/wiki/Hang_Én

   Hang Én ('swift cave' in Vietnamese, named for the birds that nest in it [1]), occasionally referred to as Én cave in English, is a cave in Phong Nha-Ke Bang National Park, a UNESCO World Heritage Site. Én is the third largest cave in the world, after Hang Sơn Đoòng in the same national park, and Deer Cave in Malaysia.

9. Travel cost analysis - Wikipedia

   en.wikipedia.org/wiki/Travel_cost_analysis

   The travel cost method of economic valuation, travel cost analysis, or Clawson method is a revealed preference method of economic valuation used in cost–benefit analysis to calculate the value of something that cannot be obtained through market prices (i.e. national parks, beaches, ecosystems).