Travelers are voting Dien Hai Citadel and Son Tay Citadel as the best forts in Hanoi. There is 1 fort in Hoa Lu Ancient Capital a city just 101 km from Hanoi. The most popular of these is Citadel Of The Hồ Dynasty in Hoa Lu Ancient Capital. You can find 3 forts in Red River Delta and 5 forts in the country of Vietnam. Our members favorite in Red River Delta is Dien Hai Citadel and Dien Khanh Citadel is the top pick in Vietnam. Want more? Check out our map of forts in Hanoi.