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.
Read more about the UNESCO World Heritage sites in the DPRK here.
Read the full story here:
UNESCO to help N. Korea’s pest control efforts at ancient tombs
Yonhap
2012-1-24
As I understand it, the world’s top arachnologists enjoy pretty much unrestricted access to the borders of North Korea.