Look online under lisboacard There is a 24hour, 48hour & 72 hour card available. The 24 hour one is 20 Euros for adults and 13euros for children ages 4-15 yrs As per the site: "The Lisboa Card is ideal for Lisbon visitors looking to get the most out of their Portuguese romp. Lisboa Card holders can take advantage of: *Free unlimited travel by public transport (bus, tram, metro, elevators and funiculars) *Free travel on CP train lines to Sintra and Cascais (popular daytrip destinations) *Free access to 26 museums, monuments and UNESCO World Heritage Sites *Deals and discounts on visits, tours, shopping and nightlife Rather than skipping the city’s top attractions, skimping on souvenirs and walking your feet into the ground, just snap up a Lisboa Card and leave your worries (and walking shoes) at home."