Day19-108 千代田区皇居外苑　Koukyogaien, Chiyoda City

山手線内100日完全踏破 EveryStreetChallenge inside the Yamanote Line, Tokyo 100日で、山手線内503町丁の歩ける道をすべて歩く。 Walking every accessible road across all 503 towns inside Tokyo's iconic loop railway. https://everystreetchallenge.jp/