La Mercé where a lot of people build towers with their bodies. It is very exciting to look at and stunning how high they can get.
This event takes place at the end of summer and is taken very seriously by the Catalan people.
The MacBa museum of art is also a must see. Barcelona has a lot of parks, my favourite one is the Parce de Montjuic, where youngsters meet to make music or do some Capoeira.
The harbour is one of the nicest areas in Barcelona. Artists draw animations of tourists on the street, Las Ramblas, and more or less rob them!