imjonseong (임존성)
A beautiful, large-scale mountain fortress with a twice-over violent history, Imjonseong was quite the surprise. Constructed by the Baekje Kingdom sometime before the 6th Century A.D., Imjonseong hosted what was left of the rebel Baekje army following the fall of the capital Sabi and capture of the royal family in 660. The Baekje restoration movement officially ended with the Battle of Baekgang in 663, but later that year, Imjonseong was successfully defended against an eleven-day assault by Silla. In an instance of history repeating itself, this fortress would become a key defensive site for the Later Baekje Kingdom in the 10th Century. Wang Geon (later named King Taejo) fought the Later Baekje King Gyeon Hwon at this site, paving the way for the foundation of Goryeo in 918.