Akiyoshido Cave (秋芳洞) is one of the largest limestone caves located in the middle of Yamaguchi prefecture. It is about 1km long that you can walk. The entire size is about 8,850m long in total. It is not just a cave, but also the river is running through this cave so that you can see the active limestone cave creations. It is registered as a special natural monument of Japan.

Tourist Info.
There is parking and a restroom.
Admission: 1300 JPY for adult, 1050 for (13 to 15), 700 for (6 to 12)
There is a group discount.
Business Hour: 8:30 to 18:30 (Mar. to Nov.), to 17:30 (Dec. to Feb.)

Access
0. at Shinyamaguchi Station or Higashi Hagi Station..
1. use the local bus to Akiyoshido 40 min.