OSAKA - Several Japanese castles with wooden structures dating back to the feudal era were destroyed during World War II. Although they were later rebuilt using steel-reinforced concrete, they have deteriorated over time and have become more susceptible to earthquakes.

Some local governments have closed the castle keeps long cherished by locals and are planning either to repair the concrete structures or restore the original wooden constructions. But the municipalities are facing problems with high costs, while debates over the two options stand in the way.

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