We will be in Barcelona Jan 5-9, 2025. Is it necessary or recommended to purchase tickets to key sites (e.g., Basilica de la Sagrada Familia, Picasso Museum) in advance? Thanks.
We were in Barcelona at that time of year. Yes, buy all your tickets in advance.
Probably necessary, always recommended. The Palace of Catalan Music (IMO a must-see) usually needs advanced purchase. I'd opt for a guided tour in English. Be sure to stop at the street-level cafe, it's beautiful. You may also want to buy tickets to a concert. Here's the official TI site for happenings in the city on your dates.
Thanks to both. That's helpful information.