Akiyoshidō cave (秋芳洞), a special national treasure, is one of the largest limestone caves in the country. It is filled with geographically precious objects such as gigantic stalagmites, rimstones like terraced rice fields, and many others. The cave started forming a million years ago and you will be fascinated with the visible history of the earth. Enjoy it thoroughly by viewing and photographing. You will walk through the cave comfortably as the temperature stays 17 ℃ throughout a year. You can go directly up to the Akiyoshidai Plateau (秋吉台) from the elevator located in the middle of the cave.