Pho Hien is a historic citadel located in Hung Yen, Vietnam. It was once a bustling trading port during the 16th and 17th centuries. Today, visitors can explore the ancient streets, visit the old houses, and learn about the rich history of the area. The citadel is also home to several temples and pagodas, offering a glimpse into the spiritual side of Hung Yen. Don't forget to try the local delicacies and traditional crafts that are unique to this region.