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#Chaeunsan #RoyalTomb #MorningWide #Tomb #Mystery #SecretDoor #Wonderland #JapaneseOccupation #UndergroundSpace #RaidDock #Reservoir Ganggyeong, South Chungcheong Province. There are two unidentified doors on a mountainside. They look like a royal tomb or an underground bunker. It turns out that the doors were built about 100 years ago! When you open the doors and go in, an unidentified structure greets you. They even say that the structure wasn't open to anyone. Where on earth does this door lead to? The story of the iron door leading to Wonderland is revealed on 'If You Know'. SBS 'Morning Wide Part 3' (Broadcast on December 18, 2023)