Mysterious building on the top of Mt. Hiei. What is it?!

My friend and I just summited Mt. Hiei and saw this strange building right beside the summit. Any ideas what it is?? It’s such an odd design and at the top of a mountain no less!

by InfiniteSystem1418

7 comments
  1. This one idiot I talked to thinks it’s for water. Seems silly though.
    No idea.

  2. It’s a water reservoir. It’s within Otsu city and looks big and well maintained (I found reference to maintenance work there as recently as 2022). So, I’d guess municipal water?

    The antenna is a TV broadcast antenna and unrelated to the reservoir.

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