![Porto, Portugal, hop-on hop-off city sightseeing tour buses at Praca Liberdade avenue in city centre, monument to King Pedro IV Stock Photo - Alamy Porto, Portugal, hop-on hop-off city sightseeing tour buses at Praca Liberdade avenue in city centre, monument to King Pedro IV Stock Photo - Alamy](https://c8.alamy.com/comp/GENXMT/porto-portugal-hop-on-hop-off-city-sightseeing-tour-buses-at-praca-GENXMT.jpg)
Porto, Portugal, hop-on hop-off city sightseeing tour buses at Praca Liberdade avenue in city centre, monument to King Pedro IV Stock Photo - Alamy
![Tripadvisor | Tour hop-on/hop-off di Porto con crociera sul fiume e degustazione di vini (opzionale) fornito da Yellow Bus Tours | Portogallo Tripadvisor | Tour hop-on/hop-off di Porto con crociera sul fiume e degustazione di vini (opzionale) fornito da Yellow Bus Tours | Portogallo](https://dynamic-media-cdn.tripadvisor.com/media/photo-o/1a/86/23/50/caption.jpg?w=1200&h=-1&s=1)
Tripadvisor | Tour hop-on/hop-off di Porto con crociera sul fiume e degustazione di vini (opzionale) fornito da Yellow Bus Tours | Portogallo
![Porto Hop-On Hop-Off City Sightseeing Bus Tour tours, activities, fun things to do in Porto(Portugal)|VELTRA Porto Hop-On Hop-Off City Sightseeing Bus Tour tours, activities, fun things to do in Porto(Portugal)|VELTRA](https://cdn2.veltra.com/ptr/20180124042138_1093760905_10104_0.jpg)