Unlike the Sagrada Familia (known as a church and not a cathedral), the Barcelona Cathedral holds the seat of the Archbishop of Barcelona, Spain. This beautiful gothic structure was built between the 13th and 15th centuries, dedicated to Eulalia of Barcelona (co-patron saint of Barcelona), a young virgin who suffered martyrdom during Roman times. Saint Eulalia's body is entombed in the cathedral's crypt.
More can be learned about Barcelona Cathedral here:
If you ever visit Barcelona, don't miss out on seeing this cathedral!