According to Yonhap:
The U.N. Educational, Scientific and Cultural Organization (UNESCO) said Tuesday it will help North Korea eradicate pests at forests near ancient tombs.
The Complex of Koguryo tombs, located in the North’s cities of Pyongyang and Nampo, has some 30 individual tombs from the late period of the Koguryo Kingdom, which controlled the northern half of the Korean Peninsula and northeastern China for more than 700 years until 668 A.D.
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UNESCO to help N. Korea’s pest control efforts at ancient tombs