Kanmon Pedestrian Tunnel in Shimonoseki, Japan

Almost nobody realizes Japan's main islands can be crossed on foot, at the midpoint of 780 meters of tiled corridor a painted line marks the boundary between Yamaguchi and Fukuoka prefectures. The Shimonoseki entrance opens onto Mimosusogawa Park, overlooking the water where the Taira clan was annihilated at Dan-no-ura in 1185, which means the whole fifteen-minute walk passes under one of the most consequential battles in Japanese history.

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