The Re-Unification of Korea

Season 5, Episode 10: The Re-Unification of Korea
What remains today of the island fortress of Cheonghaejin, Jang Bogo’s base of operations. While the trees have overgrown the rammed-earth walls, this picture gives some sense of how formidable the structure would have looked to marauding pirates. Source: Public Domain
A Map of the Korean Peninsula in 915 CE. Source: KJS615, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
The Royal Flag of the Goryeo Dynasty, featuring a Phoenix bird in flight. I think we can all agree that it is a pretty sweet flag. Source: Public Domain