Tombs of Princesses Jeonghye and Jeonghyo of Balhae
Tombs of King Mun’s daughters Jeonghye (buried 780) and Jeonghyo (buried 792), which show Goguryeo and Tang culture side by side.

Princess Jeonghye’s tomb at Liudingshan, Dunhua, is a Goguryeo-style stone-chamber tomb with a corbelled "lantern" ceiling, and yielded stone lions. Princess Jeonghyo’s tomb at Longtoushan, Helong, is a Tang-influenced brick tomb topped by a pagoda, with murals of twelve attendants and musicians. Both epitaphs call King Mun "His Majesty the Emperor".
Balhae culture built on Goguryeo foundations while absorbing Tang influence, as seen in the Goguryeo-style seated pair of Buddhas (Lotus Sutra devotion), the stone lantern of Sanggyeong, ondol heating, lotus-pattern roof tiles and ridge-end ornaments.