Phu Lam is a famous local palace that was a military base in the Trần Dynasty, located in the mountains of the southern fortress of the ancient capital Hoa Lu, and they established this base in the past to reinforce their forces and defend themselves to liberate Dai Viet in the War of Resistance to defeat the Mongol invaders for the second time, and the palace played a major role in many other historical events, which is why it was declared a world archaeological site.