
Siphon Sitterstollen is a small historic hydraulic tunnel near Herisau — dramatic vaulted concrete/stone interior, water flow reflections and strong leading lines make it ideal for moody industrial and waterscape shots. Visit at blue hour or after rain for enhanced reflections; weekdays minimize hikers. Easy roadside access (Wilen 307), limited parking — respect fences and private infrastructure; bring waterproof shoes. A slice of Swiss engineering framed by woodland and moss-covered stone.

Siphon Sitterstollen is a small historic hydraulic tunnel near Herisau — dramatic vaulted concrete/stone interior, water flow reflections and strong leading lines make it ideal for moody industrial and waterscape shots. Visit at blue hour or after rain for enhanced reflections; weekdays minimize hikers. Easy roadside access (Wilen 307), limited parking — respect fences and private infrastructure; bring waterproof shoes. A slice of Swiss engineering framed by woodland and moss-covered stone.