William. Our friend Zuzu Coco bequeathed us with these photos of Ooharaaso Shrine （大原阿蘇神社） in Kikuyomachi. As is clear from the photo, the site is accessible by rail on the JR Aso line. Disembark at Haramizu Station and turn right. Details at the link.
http://www.komainu.org/kumamoto/kikuchigun_kikuyomachi/oohara_aso/oohara_aso.html