Wunu Mountain City, a key component of the Capital Cities and Tombs of the Ancient Koguryo Kingdom UNESCO World Heritage Site in China, served as the first capital of the Goguryeo Kingdom from 37 BCE to 3 CE. This well-preserved mountain city showcases innovative architecture and city planning, featuring significant relics like palaces and military structures that reflect the kingdom’s distinct culture. Designated in 2004, it highlights the Goguryeo’s historical expansion and influence across Northeast Asia over seven centuries.