Ly Manh Thang, deputy director of the provincial museum, said they found traces of the Lang Dao pagoda at Tan Hong hamlet, Tu Thinh commune of the district. It was built in the Tran dynasty (13th-14th century) and lasted until the Le So dynasty (15th-17th century). 

Archaeologists also uncovered a gravesite from the time of the Hung Kings in Thuong Am commune, Son Duong district. The site is 3,000 years old. 

Other discoveries include an ancient well in Tan Trao commune and a fossilized elephant tooth in Hong Lac commune of Son Duong district. 

Son Duong district has been called the "land of old relics".