It's not a temple, is it?

 I walked to the front of the platform to get a better look. The little stone building in the center had something in it so I went closer.

 On the right side was this statue, probably of a Bodhisattva and in middle were the ashes from incense.

 This says that this place is in commemoration of the war dead, with no indication of what war. At this point an old man and woman came and started cleaning up around the place. It was clear that my presences was not particularly needed so I left, thinking that I would return again after the trees were green again.

Back on the road, I looked back down the lane. The platform is on the right under the trees.