Anna and Ellen Pigeon
... that mountaineers Anna and Ellen Pigeon made their most famous traverse in the Swiss Alps by mistake?
... that <a class="mw-redirect" href="./Mountaineer" id="mwAi0" rel="mw:WikiLink" title="Mountaineer">mountaineers</a> <b id="mwAi4"><a href="./Anna_and_Ellen_Pigeon" id="mwAi8" rel="mw:WikiLink" title="Anna and Ellen Pigeon">Anna and Ellen Pigeon</a></b> made their most famous <a href="./Traverse_(climbing)" id="mwAjA" rel="mw:WikiLink" title="Traverse (climbing)">traverse</a> in the <a href="./Swiss_Alps" id="mwAjE" rel="mw:WikiLink" title="Swiss Alps">Swiss Alps</a> by mistake?