Among them are the pictures of four guardians at three tombs in Sammyo-ri, Kangso District, which have been highly appreciated as a masterpiece representing the Eastern pictures of four guardians in the history of medieval world fine arts.

Though a thousand and several hundreds of years have passed, the murals in the big and medium tombs still keep their original colors.

Seen in the murals are guardians of all directions--blue dragon in charge of the east, white tiger the west, phoenix the south and snake and tortoise the north-- together with other paintings like vine patterns, Spirits, mountains and animals.

Three Tombs in Kangso have been preserved well as a national treasure, thanks to the policy of the Workers' Party of Korea on the protection of national heritage.