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The article is sources from various tourist sites, which are no way serious historical reference. We need better sources on who built them and why wand was there any system. If you look at the map of the trail, it is easily seen that it is not along any border of Śląsk and Malopolska, since it runs right into Kraków. And in no way this line of castles could defend Kraków, as some tourist guides claim. What is most definite is that "Eagle's Nests" ("Orle Gniazda") term is a novel invention and not a historical name of anything in Poland. Staszek Lem (talk) 23:27, 15 September 2017 (UTC)[reply]