There are some interesting objects in the woods.
You can see a monument of 9th Riot Police Unit here.
Please bring your pen.
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The monument is at the end of the trail from the main ridge to Zoushuin temple. If you are coming from Zoushin temple, there is a gate that is closed most of the time. Take a road along the wall to go around it. You should have no problem if you are coming down from the ridge.