Not sure how many of the Gaudi houses my daughter will want to visit. Which one do you recommend the most - Casa Batllo, Casa Mila (La Pedrera), Casa Amattler? Or other?
If I purchase tickets online, must I print them out or can I just show the confirmation on my cell phone? (Also for Segrada Familia...if I purchase from my phone with no access to a printer...)

Casa Amattlar is not by Gaudi -- it is by one of the other Modernists, I believe Puig i Cadafalch.

I only visited La Pedrera for its evening visit / roof deck light show. I enjoyed that, but since you say nothing about your daughter's age, it's hard to know if it would be appropriate.

Much as I loved Gaudi's Palau Guell, I think the Casa Batlló may be more representative of Gaudi's mature style. Just my opinion....

Thanks. It is a pre-wedding special trip for my adult daughter. There is so much I want to do, that I may need to streamline a bit...so I thought one casa might be enough.

If I could only see one I would choose La Pedrera. Casa Batllo is only a couple of blocks down the same street so it is easy to do both in one day, although a bit overwhelming. My recollection is that we needed to show the hard copy of our tickets.
We paid a bit extra on some of the tickets to have an untimed entrance, thus giving us more freedom. Enjoy!

Maybe do the nighttime (after 9pm) "Gaudí's Pedrera": https://www.lapedrera.com/en/visits/...ra-the-origins

And, as said, Casa Battló is only some 200 meters away.

Yes, we chose both La Pedrera and Casa Battlo planning on doing them together, but because we had an untimed undated entry for Casa Battlo we were able to do them on separate days. Our hotel was very nearby. We only saw the outside of Palau Guell.

We chose an entry for the Sagrada Familia with the audioguide and were glad we did.

I hope you also go to Parc Guell, I was more impressed at that and his forethought than the houses. Take a guided tour and see how ahead of his time he was.

I wondered where you came across Amatller as Gaudi, as it isn't. It doesn't even look like Gaudi's work (certainly not from the outside, which looks Dutch). But it is right next to Casa Batllo, so you could easily visit both if she is particularly interested in modernism architecture/decorative style, but it doesn't sound like it.

I think both are interesting, but if one can't choose and location is irrelevant (ie, one isn't more convenient and you don't want to combine with the Amatller house), I'd probably say the Pedrera is a more innovative piece of architecture in terms of its design and engineering. Casa Batllo was a redesign of an existing building. Casa Batllo is also the most expensive of all of these, Amatller is about 10 euro cheaper than the Gaudi. Cost between the other 2 isn't that different, but the Pedrera is a euro cheaper or so. Both sell these premium tickets online that let you skip a queue, but even if you buy in advance online with the regular ticket which is cheaper, it doesn't. I guess you skip the ticket queue, anyway, though.

Yes, Parc Guell is a must!! We really loved Barcelona. Took a private guide for the Jewish Area and Gothic Quarter. Spent some time on Montjuic, had a lovely lunch at the Barcelonetta Restaurant, did a day trip to Girona, walked and walked and walked. Oh, one of the best things we did was to go to a concert (we saw Peter and the Wolf) at the Palau de la Musica. Don't forget to go hungry to the market La Bougeria.

My mistake about Amatller. Nighttime Pedrera is a good idea. I will see how that fits in. Parc Guell is certainly on the list, as is a day trip to Dali museum in Figueres. Never enough time!
Thanks all.

If you are going to do interiors I would definitely vote for Casa Battlo, where you get to see the owner's apartment. I found the apartment in Casa Mila to be a big disappointment.

I went on a few free walking tours with Runner Bean - great intros to a few Gaudi houses including La Sagrada Familia. Interior tours are not part of the free walking tours but I returned separately on my own to visit locations that piqued my interest.

Tip what you'd like at the conclusion of the tour. I like Runner Bean so much that I also signed up for their Old City tour.

Please also consider Parc Guell - it was amazing! I felt like a child being on those grounds.