Hoi An Ancient Town - Hoi An World Heritage

http://www.hoianworldheritage.org.vn

Three of Southeast Asia's most magnificent UNESCO historic sites are from Vietnam.

More than 40 UNESCO World Heritage monuments are located in Southeast Asia, according to the renowned British travel publication Wanderlust, which has compiled a list of the region's top heritage monuments. Up to three of Vietnam's representatives are on this list.
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The first place representative of Vietnam is Ha Long Bay in Quang Ninh province.
 
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The second place representative of Vietnam is Hoi An in Quang Nam province.
 
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Last but not least, the place is Phong Nha-Ke Bang National Park in Quang Binh province. 
As stated by Gypsy