For over 100 years asphalt was laboriously mined in the underground asphalt mines of La Presta and exported all over the world for road construction. Today the mines are no longer in operation and are partially open to the public as a museum.
From the Sihlsprung up to the entrance to metropolitan Zürich, the valley is a mixture of urban and rustic landscapes. The origin of the Sihl River is to be found on the 2283-meter Drusberg. The Sihl flows through the Sihl Lake near Einsiedeln and meanders through the Sihl Valley (Sihltal) towards Zürich.
Niklaus von Flüe lived from 1417 until 1487, first as a farmer and councilman, then as a hermit in the Ranft Ravine. The mystic and peacemaker, who was canonized in 1947, is Switzerland's national saint and the patron of numerous churches.