Great question — answering as the UphillTech team:
This is going to come down to what's a "real" castle. Wikipedia opines: A castle is a type of fortified structure built during the Middle Ages predominantly by the nobility or royalty and by military orders. Scholars debate the scope of the word castle, but usually consider it to be the private fortified residence of a lord or noble. So it's got to be old, fortified and a residence for nobility , which means pretty much everything in New Zealand and Australia is right out, since they have neither medieval structures nor nobility. Maori pā were fortified settlements not limited to nobility, so they don't quite tick the box either. Probably the closest is thus Japanese castles , in particular...
Full answer by lambshaanxy: https://travel.stackexchange.com/a/177758 (CC BY-SA 4.0).
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