Starting at Praça da República 5, 8800-394 Tavira, open the Explorial app and enter the 6-digit game code that you received by text and Viator chat message to begin. The route leads you through Tavira's quietly beautiful Old Town, a tangle of whitewashed streets, tiled churches, and river views. The first clues take you to the Câmara Municipal de Tavira — the elegant town hall that anchors the main square and houses centuries of civic history. From here, the trail climbs toward the Castelo de Tavira, the old Moorish castle whose walls offer fine views over the terracotta rooftops and the Gilão river below. The app then guides you down to the Ponte Antiga — the ancient seven-arch bridge crossing the Gilão, believed to have Roman origins and one of Tavira's most enduring landmarks. Around 2 hours of walking, any group size. A fully charged smartphone with mobile data is required.