SIGHTSEEING BUS IN PORTO Porto has several sightseeing bus  services (hop-on hop-off tourist buses), which are a practical and comfortable way to discover the city’s main attractions, especially for first-time visitors. 🚍 How sightseeing buses work Double-decker buses, usually with the upper deck open for panoramic views. Operate on a hop-on hop-off  system: you can get on and off at any stop along the route, using the same ticket for 24h or 48h. Include multilingual audio g