Lately, TripAdvisor, the most popular visited website in the travel industry has released the list of 25 most visited Asian cities in 2018. Out of all the other nation, Vietnam has been marked four times on the top 25 as the most attractive cities in Asian. The 4 Vietnamโ representatives is Ha Noi, Ha Long, Hoi An and Ho Chi Minh City. So, what make the cities so special? Letโs find out!