The Upper Citadel area in front of Ngo Mon Square in the former imperial city of Hue is the highest and most important area in the defensive walls of Hue. (Photo: VNP) 
Hue always offers new images and emotions. No matter how much you are attached to the city and want to learn, you can’t stop being surprised. (Photo: VNP) 
Ngo Mon Gate seen from the top of the citadel in the flag area. (Photo: VNP) 
Foreign tourists visit the Upper Citadel of former imperial city of Hue. (Photo: VNP) 
The walls protecting Hue Citadel have a circumference of about 10km and are nearly 7 metres high. The citadel (Upper Citadel) is more than 20 metres wide, with the outer wall having a moat as its outermost defence. (Photo: VNP) VNA
