Ryusendo Cave and Ryusen Shindo Science Museum
Ryusendo Cave is counted as one of the three largest limestone caves in Japan and is also designated as a national natural monument. The length of the cave is already known to be over 4,088m, and the total length is said to reach 5,000m. In addition, fresh water gushing out from the depths forms several underground lakes, and the third underground lake is 98 meters deep and boasts one of the clearest waters in the world. The dragon blue lake water, which hides the breath of nature's finely honed nature, and the countless stalactites inside the cave will transport you to a fantastical world.