Mausoleum of King Wang Kŏn
The Mausoleum of King Wang Kŏn (Korean: 왕건왕릉), more correctly known as the Hyŏllŭng Royal Tomb, is a mausoleum located Haesong Village, Kaesŏng, North Korea. The tomb belongs to the founder of the Goryeo Dynasty, Wang Kon, who received the temple name 'Taejo' and was the first monarch to unify the entire Korean peninsula after the subjugation the southern states of Silla and Baekje.
Source: Wikipedia — Mausoleum of King Wang Kŏn (CC BY-SA 4.0)