The Eight Prisons in Beifu are Haiti Hell, Mountain Hell, Kitchen Hell, Ghost Mountain Hell, Ghost Stone Square Hell, White Pool Hell, Blood Pool Hell, Tornado Hell. The first six come together in fifteen minutes from Bus Station in Beifu. The latter two are about 20 minutes from Bus near Haiti Hell, or about 20 minutes from JR Kurikawa Station. In addition to mountain hell, there are other combined tickets including transportation fees, and the station has to buy them. If you buy it alone, 500 yen for Mountain Hell and 400 yen for the rest. Personally, I think it's enough to see Haiti Hell.