Solothurn is obsessed with the number eleven — eleven churches, eleven fountains, eleven chapels, and a cathedral with eleven altars and eleven bells. This trail lets you count for yourself. This app-led scavenger hunt takes you through Solothurn on foot, using phone-based riddles to guide you from one landmark to the next. No guide, no fixed start time. • Climb the steps of the St. Ursen-Kathedrale, the baroque showpiece built to the...