Hang Pagoda Festival (also known as Huong Nghiem Pagoda) in An Khang Commune (Tuyen Quang City) is held on January 8 every year. This is an ancient temple built in the 16th century, built in 1537 under the reign of Mac Dang Doanh in a rocky cave. The pagoda also preserves the ancient stele carved on the cliff, two bronze statues of Bodhisattvas, a reading stand, incense, and tray of the Nguyen dynasty. The pagoda is located in Huong Nghiem mountain, in Phuc Loc village, in the relic complex with Bau Citadel, Binh Ca wharf. This is a place with charming natural scenery, a land with a rich culture with the place Truong Thi - the place where the exams of the feudal dynasties were held. From the beginning of Phuc Loc village to the end of Tan Thanh village of An Khang commune, there is a mountain range bearing the shape of a winding dragon, Huong Nghiem mountain is likened to a dragon's head. This is also the place to hide and assemble the first two aircraft of the Vietnamese Air Force before moving to Soi True airport, Vinh Quang commune (Chiem Hoa). Hang Pagoda has been recognized as a provincial historical relic. Over time, Huong Nghiem Pagoda no longer preserves historical vestiges of the resistance wars, but only preserves valuable artifacts such as a system of worshiping statues, incense altars, etc.