Last weekend I had friends visiting, they had been already sometimes in Barcelona so they know the city already quite well, therefore we wanted to do something different and on Sunday we decided to go to the IMAX cinema in Port Vell.
We took the line 3 (green) in direction to Zona Universitaria and got off in Drassanes, at the end of la Rambla. You can also take line 4 (yellow) in direction to Pep Ventura and get off in Barceloneta. I recommend that you get early there because the tickets do not have seat numbers and if you want to have a good seat, you must be one of the first ones in the queue. The ticket for a double session costs 10€ but it is really worth the money!