Two churches in Barcelona. Santa Maria del Pi has no online ticket listed; Sagrada Familia has 125 tickets and tours to book. The table and the two notes below put them side by side; the full pages have what to see, the ticket and the timing for each.
A modest ticket covers the church, the small museum in the chapterhouse and the bell tower, and the combined version is the only one worth buying. The tower is 54 metres and about 150 steps, with a view over the Gothic Quarter and the Ramblas that is better than anything from street level. Guitar and flamenco concerts are staged in the nave most evenings and are ticketed separately by promoters;
Every ticket here is timed and almost every one sells out days ahead, so booking is not optional. The base ticket covers the church and the crypt where Gaudi is buried. Adding an audio guide costs a few euros more and is worth it, because nothing inside is labelled. A guided tour in a group of about twenty costs roughly double the base ticket and lasts an hour, after which you may stay on alone.