This article is a presentation of borderology by relating the concept to three different senses of the word "nature"; (a) wild nature, (b) nature as dynamic activity and c) nature as Stoic. It is the third sense of "nature" that is my main concern. By "nature as Stoic" I am approaching the Stoic idea according to which Man and culture are embedded in Nature, due to Man's membership not only in his own, but also in the "city of Nature". My point is that Kant's engagement to establish cosmopolitan rights is based on a reinterpretation of the relation of man and nature by taking the Stoic idea of man as belonging to another city as his point of departure. To support my argument, the article launches an interpretation of Kant's idea of the Visitor, which makes the cosmopolitan right of visiting the other city politically concrete.