This interesting ensemble is located in Quyen Son Village, Thi Son Commune, Kim Bang District, 7km from Phu Ly City, along National Road 21. With an area of approximately 10ha, this is a truly romantic landscape of mighty mountains and poetic oleander forests.

Truc Temple was built to worship Ly Thuong Kiet, a national hero who came there to a halt on his way to conquer the South during the 11th century. On the way back from the successful expedition, he again stopped at the mountain to celebrate his triumph.

By the side of Truc Temple is Ngu Dong Thi Son, which consists of five conjugate caves in the poetic mountains of the Cam chain. Inside, you can observe the various interesting-looking stalactites and listen to the concert created by the wind as it is wailing through the stones of the mountains.