side streets There are many pretty, little side streets to the old town from Las Ramblas.
interesting shops One can often find interesting shops or little restaurants in these side streets.
old church Like here, sometimes a entrance to an old church is hidden in these side streets.
Sagrada Familia The figures at the west front (momentary entrance) of the Sagrada Familia are quite disputed, since they are not represented "as close to life" as at the east front, but rather modern. But I like this style even better.
finished by 2020!? They started to build this stunning Cathedral  in 1882, and they will supposedly finish it by 2020 -- No way!
climbing Climbing the towers in the summer heat is quite a bit of work.