The flagpole of Phai Ve mountain can be considered as one of the famous symbols of Lang Son city. Located on Phai Ve mountain with an altitude of about 80m, this flagpole consists of 535 solidly built stone steps. The entire flagpole is built with durable materials such as stone-clad concrete. The stair railing going up is faked like green bamboos that look quite like the Great Wall. Perhaps because the image of the towering flag tower with the meandering steps is quite similar to the Great Wall. Therefore, this place is known as the Great Wall of Vietnam, a miniature version of Vietnam.