The Gotthard Tunnel in Switzerland runs from Göschenen in the Canton of Uri at its northern portal, to Airolo in Ticino to the south, and is in length below the Gotthard Pass.
== Sklici ==== Zunanje povezave ==*"Leonardo da Vinci: anatomical drawings from the Royal Library, Windsor Castle", exhibition catalog fully online as PDF from The Metropolitan Museum of Art, which contains material on this technique (see index)