The Barcelona Card
features unlimited free travel on public transport and free admission and discounts at around 100 visitor attractions.
The card is available for purchase for periods of between 2 and 5 days, costing €24 for a 2-day card and €34 for a 5-day card.
If you don't plan to see lots of museums every day, then it is cheaper to buy transport-only tickets (see above).
But there are many things that you will want to do in Barcelona that are not eligible for discounts.
You can't use the Barcelona card on fun transport options like cable cars, funiculars or trams, for example.