Knowing these 2 places when I searched the information to travel to Japan. Thank you for the sharing. I hope can visit here in one day. Do the 2 caves open every day in a year?
Sai-Jo Mountain(妻女山) in Nagano(長野) area is the stage of Battle Field by Takeda Shinken(武田信玄).... (in the Zen-goku Times) Detektive Conan Volume 86 contains some related interesting episode for this Mountain....!!!!!!