Introduction to Qinyan Tower: Qinyan Tower is named after Dujiangyan was built in the Qin Dynasty. It is the best place to overlook the panoramic view of Dujiangyan. Qinyan Tower stands against the mountain, standing majestically on the river bank, with exquisite structure and spectacular majesty. Before it was built, this was the "Observation Deck", also known as the "Happiness Deck".