A sister castle or twin castle relationship is the castle equivalent of sister city, between two geographically distinct castles, usually by agreement between two local governments famous for castles. Some Japanese castles establish sister relationships with not only domestic castles but also European castles.
A sister castle or twin castle relationship is the castle equivalent of sister city, between two geographically distinct castles, usually by agreement between two local governments famous for castles. Some Japanese castles establish sister relationships with not only domestic castles but also European castles.
Source: Wikipedia "Sister castle" · CC BY-SA 4.0
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