Map of important routes through the Alps
<a href="https://de.wikipedia.org/wiki/User:Chumwa" class="extiw" title="de:User:Chumwa">Maximilian Dörrbecker</a> (<a href="https://de.wikipedia.org/wiki/User:Chumwa" class="extiw" title="de:User:Chumwa">Chumwa</a>)
CC BY-SA 2.5
Own work  using: <a href="//commons.wikimedia.org/wiki/File:Alps_location_map.png" title="File:Alps location map.png">this file</a> by <a href="//commons.wikimedia.org/wiki/User:Lencer" title="User:Lencer">Lencer</a>