https://www.verzasca.net/articles/176_Via.Alta.della.Verzasca
Many people come from far away to take this 6-day (60km) hike, one of the wildest hikes you will find in Switzerland. Via Alta is a difficult hike, not for beginners. It goes along the ridge separating Val Verzasca from Valle Leventina, offering extraordinary views throughout the whole hike. You can sleep in the mountain huts along the way, the reservations are recommended in the high season.
The FKT route is between the first (Capanna Borgna) and last hut (Capanna Barone) on the classic Via Alta della Verzasca route. Many people take a gondola to the first hut, and there are 2 routes down into the valley from the last hut.