In June Juche 102 (2013), the World Heritage Committee of the UNESCO registered the mausoleums of kings Wang Kon and Kyonghyo, Kaesong Walls, Nam Gate of Kaesong, Sonjuk Bridge, Phyochung Monuments, Sungyang Confucian Shrine, Koryo Songgyungwan, Manwoldae, Kaesong Chomsongdae, Seven Mausoleums Cluster and the Myong Mausoleums Cluster, some of the relics, as world cultural heritages.

Wang Kon (918-943) was the founder of Koryo and Kyonghyo (1352-1374) was the 31st king of Koryo.

The Kaesong Walls was built as the outer castle of Koryo from 1009 to 1029 and the Nam Gate of Kaesong from 1391 to 1393. There is the famed Yonbok Temple Bell on the gatehouse of the Nam Gate of Kaesong.

The Sonjuk Bridge was a stone bridge where Jong Mong Ju (1337-1392), a high-ranking official of Koryo, got killed and the Phyochung Monuments were constructed in praise of his loyalty to the king.

The Sungyang Confucian Shrine was built on the site of Jong's house in 1573 as a place for disseminating Confucianism together with education.

The Koryo Songgyungwan was constructed as the highest educational institution of the state in 992. It has several attached buildings like Myongryun Hall and Taesong Shrine.

The Manwoldae was a site of the Koryo royal palace and the Kaesong Chomsongdae was an astronomical observatory.

The Seven Mausoleums Cluster was built at the foot of Mt Mansu. The scale, structure and relics of the mausoleums show that they are the tombs of persons related to the royal family active in the closing years of Koryo.

The Myong Mausoleums Cluster consists of three tombs, and one of them is known as the Mausoleum of Hyonhyo (1345-1348), the 29th king of Koryo.

The above-said historical relics are well preserved in their original states, thanks to the policy of the Workers' Party of Korea for protecting national heritages.