Oviedo has been quietly perfecting its old-town charm for centuries — time to put it to the test. This app-led scavenger hunt takes you through Oviedo on foot, using phone-based riddles to guide you from one landmark to the next. No guide, no fixed start time. • Take on the Catedral de Oviedo, a Gothic masterpiece whose crypt holds relics from across Christendom • Seek clues through Campo de San Francisco, Oviedo's beloved central park...