this one is about touring the obscure! This is going to be partly at least about the exercise of going to the end of the train line, to somewhere where you would perhaps not otherwise go, and just see what you can see (aka Mr Mink doctrine of "accidental tourism"). In this case the the choice of the end of the line was not completely bizarre -- in fact it is simply a question of following my favourite metro line, line 4, from Porte d'Orleans which is where I am staying south of Montparnasse to the northern end of the line at Porte Clignancourt. This does of course have the advantage of not having to change lines anywhere. And believe me if there are various choices of "correspondance" (line change) some places are better than others
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