We visited Montjuic the morning we boarded the cruise (stayed the night prior in Barcelona in an apartment booked through airbnb). Beautiful views of the port and cruise ship! Wonderful way to start the vacation. Take the funnicular from the metro stop and then as you exit the funnicular at the top walk right up the ramp to take the cable car further up to the castle. We did not go into the castle but walking around the area and to the lookout point is free. Can also visit Olympic Stadium from there which we would like to do next time.
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Norwegian Cruise Line