Binh Son Tower, also known as Vinh Khanh Pagoda Tower or Then Tower, is an ancient tower, which is said to have originally had 13 floors, but now only 11 floors remain. The tower was built in the Tran dynasty, located in the campus of Vinh Khanh pagoda (Then temple) in Binh Son village, Tam Son town, Song Lo district, Vinh Phuc province. As a typical tower for the architecture of pagodas and towers of the Ly - Tran dynasties in Vietnam and the tallest terracotta tower of the Tran dynasty remaining to this day, Binh Son tower has elegant shapes, soft lines, stylish decoration. It is a historical and artistic relic of high value in the territory of Vietnam. Binh Son Tower has been ranked as the last remaining special national monument from the Ly-Tran dynasties in March 2016.