An absolutely beautiful building, with an incredibly fascinating history. Definitely worth a visit; the inside is simply breathtaking so definitely worth going in rather than looking from the outside.
My boyfriend and I booked a “skip the queue guided tour” which was most definitely worth it. We both felt that we picked up on so much more, and many interesting details were pointed out to us that we might otherwise have missed. The guide was very knowledgeable and very thorough, answering any questions anyone had.
A must see if you’re in Barcelona, and certainly worth doing a tour.