Cheap taxi from Haiphong airport to Son Tay Ancient Citadel

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It takes 2 hours from Haiphong airport to Hanoi through 5B express highways around 100 km you arrive Hanoi
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Son Tay ancient citadel is located between Son Tay town, distance center of Hanoi than 40km. This is an ancient military architecture, was built in the reign of King Minh Mang in 1822. It has the style of a Vauban fortification and in time French architects praised it as a masterpiece of Vietnamese architecture.
There were four main gates also made of bee-stone (laterite), the special material from Xu Doai. The citadel was where the kings of the Nguyen Dynasty lived and worked when in the area.Citadel have quadrilateral, trapezoidal cross-sections, sincere 6m wide, 4 meters wide aspects into, there are many holes in the top to the soldiers hiding out in shooting or stabbing spears are long enemy when they climb the walls.