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#Colosseum #Circular building #Morning Wide #SBS Wide #Shinmiyangyo #Ganghwa Island Defense #Military facility #Giant circle #Ganghwa Island Don-dae #Small fortification #Mystery #Secret of the building #Geonpyeong Don-dae fire cannon #Protect Joseon On the top of Ganghwa Island, on a mossy rock wall, there is a huge circular building with a diameter of 36m. While examining the building, I was able to find narrow entrances in the east, west, south, and north. When I carefully went inside, it was empty except for bushes, and there were several holes facing the sea. After interviewing people living on Ganghwa Island, I guessed that it was a helipad. But the surprising thing is that there are 54 such buildings on Ganghwa Island! What on earth are the large, round buildings that can only be seen on Ganghwa Island? SBS 'Morning Wide Part 3' 'Mystery M' (Broadcast on November 20, 2024)