Hap Nhan is a famous tower in Phu Yen associated with many unsolved mysteries. The tower is located near the top of Nhan mountain on the north bank of the Da Rang River. There are many legends about the origin of this tower. Some people believe that, in the past, there was a fairy Thien Y A Na who came to earth to teach people living in this land everything from plowing, weaving, spinning ... to find a way to make a living. After the fairy returned to the fairy realm, the people of Champa, out of compassion and want to inscribe the gratitude of the person who enlightened their nation, built that tower to worship.