If you're an architecture fan, go ahead and see the central hall, it's beautiful. There are a lot of other interesting buildings around it. You can't really enter the city hall unless you've an event or something. You could take leisurely strolls with good views.
If you stay near the place, then go ahead and take a look (no entrance fees or anything), but if you stay far from Nakanoshima, it would be better to look at other sights, because the train fees aren't worth it.
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