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 Zool?gico de Lisboa), the oldest zoo on the Iberian peninsula, where you’ll gain entrance to view the exotic animals. Your 48-hour ticket gives you access to two different bus routes, the Bel?m and the Oriente lines, bringing you close to sights such as the Monastery of St Jerome (Mosteiro dos Jeronimos), UNESCO-listed Bel?m Tower (Torre de Bel?m) and the Monument to the Discoveries.