Moji (門司), in the the city of Kitakyūshū, is as close as one can get from Kyushu to Honshu without actually being in Honshu. As such, the town was developed as a railroad terminus and port from the Meiji era. Driving north on the Kyushu Expressway, you’ll see signs every few kilometers indicating the distance to Moji no matter how far south you are.
JR has renovated its railway terminal there, a gorgeous art deco style building (or perhaps an example of Japanese-Western eclectic architecture - architects, please weigh in https://en.wikipedia.org/wiki/Japanese-Western_Eclectic_Architecture ) whose earliest incarnation dates to 1891; it will open on 3/10. If you’re looking for a fun spring getaway, this might do the trick. - William