A Japanese castle is a complex of structures made with multiple towers, walls and gates. The core of the castle, called honmaru, includes the main keep (tenshu), gates, defensive walls and at least a turret (yagura), like in this photo taken at the Bitchu Matsuyama Castle, the only surviving mountain castle.

Bitchu Matsuyama Castle, Takahashi, Okayama

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Yesterday’s Japan Photo: Yasukuni shrine Noh stage