A few of my favourite things to do in Barcelona — the tours and sights I'd actually recommend, from Gaudi to the old town, all bookable online. I'm heading there myself this winter, so these are the ones I'm looking at too.
Gaudi's unfinished masterpiece, the one thing in Barcelona you really shouldn't miss; book ahead, it sells out.
Barcelona: Sagrada Familia Entry Ticket with Audio Guide
Same jaw-dropping church, with a guide and no long wait in line.
Barcelona Sagrada Familia Skip-the-Line Guided Tour
Gaudi's fairy-tale park, all mosaics with views over the whole city.
Barcelona: Park Güell Admission Ticket
The dragon-roofed house; the audio guide brings it to life room by room.
Barcelona: Casa Batlló Entry with Self-Audioguide Tour
Get in before the crowds, when the morning light is perfect for photos.
Barcelona: Casa Batlló Be The First Entry Ticket
A day out to the mountain monastery, with the cogwheel train ride and a winery stop.
Barcelona Montserrat, Cogwheel, Black Madonna & Winery Tour