Cruise through lisbon aboard a double decker sightseeing bus hopping on and off at various points throughout the city and ending up at lisbon zoo jardim zoolgico de lisboa the oldest zoo on the iberian peninsula where youll gain entrance to view the exotic animals your 48 hour ticket gives you access to two different bus routes the belm and the oriente lines bringing you close to sights such as the monastery of st jerome mosteiro dos jeronimos unesco listed belm tower torre de be