You may have heard of the very famous 17th century samurai Miyamoto Musashi. He was an infamous rōnin who was undefetead in 60 duels and known for weilding two swords. He also wrote The Book of Five Rings, a book on strategy, tactics, and philosophy.
He actually spent his last few months in Reigando Cave in Kumamoto Prefecture writing that book. The cave itself is carved into a large exposed rock face that sits deep on the grounds of Unganzenji temple. But the cave itself is thought to be much older than the temple.
The temple grounds are famous for the statues carved into the rocks of Buddha's five hundred disciples. Each statue has a unique facial expression and body.
If you're interested in visiting, tofugu did an honest review of the location and you can learn more about it from them.
Straight on to my pictures from the adventure! Sorry if some of them are a little blurry, my apologies.