For adults the Lisboa Card costs: 24 hours: € 21 48 hours: €35 72 hours: €45 For children (4 - 15 years) costs the Lisboa Card : 24 hours: €13.50 48 hours: €21 72 hours: €23 Tip : the card goes by the hour. This allows you to use it, for example, from 12 o'clock in the afternoon until 12 o'clock the next day. So it's pretty smart to calculate this properly  Here you can order the Lisboa card. And it is wise to buy the card at once for several days in a row. You can of course also buy 2 separate days, but in principle you will pay more.