By the way - how easy would it be to have "Hot spot maps"? We have all the data and such maps would provide visible confirmation of the correctness/practicality of a hotspot and, in so doing, a useful planning tool. I have been re-visiting the definition and it is inevitably judgemental to a degree on how one is travelling (car/bus) and how hard one wants to travel etc etc. A map would also provide a calculated "geographic" centre.
Not hard. We can have maps for all connections. Originally, Els didn't like the idea, though, so please check with her.
I also think it is a good idea to add "text" about the practicalities of a journey (E.g as for Iwami Ginzan in the Hiroshima hotspot) to explain/justify an inclusion. The whole purpose of Hot spots is a planning aid rather than identifying "extreme" possibilities of which there are many!
Text is already possible. To go to the silvermine you need to take the bus from Hiroshima Station.