Shinkansen  from Kyoto to Tokyo and then changed for  Takasaki. Takasaki is a small town in the Gunma Prefecture surrounded by mountains.
First day went to Mt Kannonyama to see the cavern. Taxi up there but walked 80 minutes to get back to the hotel. No taxis or buses.
The cavern was built by a business man who started building in 1919 and continued building till he died in 1964. The tunnel was built using sheer manpower with shovels and pickaxes. There are 33 statues in the tunnel.