What are some of the best historical, cultural, and natural sights in Kyushu?
Yeah, it's a broad question, but I just want some ideas. I think I'm going to be going there, so I might as well see what I can see. It doesn't matter what prefecture, so anything you can add is good.
In my very limited research, I have found these (listed by prefecture):
Saga Prefecture: Karatsu Castle, Yutoku Inari Shrine
Fukuoka Prefecture: Dazaifu Shrine, Kushida Shrine, Hakozaki Shrine
Oita Prefecture: Jigoku meguri
Nagasaki: Martyrdom of 26 Saints Museum, Peace Park/Atomic Bomb Museum, Kofukuji, Suwa Shrine, Dejima, Mount Inasa
Miyazaki: Takachiho
Kagoshima: Saint Xavier Monument
Kumamoto: Kumamoto Castle, Aso Shrine
Do you know of any interesting historical, cultural, and/or natural places that you feel are truly worth visiting in Kyushu?