Inside the tunnel, there are several observation spots and art installations scattered along the way, which made it feel like a fun little adventure. Even in summer, it's cool and comfortable inside. From the observation points, you can get an up-close look at the columnar joints of Kiyotsu Gorge, which is really impressive. There are also foot baths and hot springs outside, so I’d love to come back in the fall and try the hot springs too.
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