With 43 conveniently located stops around the city, City Sightseeing Porto makes touring Porto both easy and fun. Visitors can see the main attractions of a city comfortably seated on the famous open-top red buses. The double-deck panoramic buses are equipped with audio guides in several languages. Just hop off to see the destinations you want to explore up close and then hop back on whenever you want, all you have to do is present your valid bus tour ticket! The Blue Line starts off at the Torre dos Clérigos and the Red Line starts at Riberia. Remember, you can switch between bus lines at your disposal!