Time Out says
Make your way to Plaça Sant Jaume on Sunday 22 for an introduction to the Catalan tradition of human tower building, curated by Minyons de Terrassa and Castellers de Vilafranca 'castells' (human towers) groups, who will also be participating in their own tower building. This is also an important place to be for the groups who participate throughout the day, as this year they're getting together to celebrate the 50th anniversary of the Castellers de Barcelona. Tower builders from every corner of Barcelona share their passion with festivalgoers and demonstrate that, although the proud Catalan tradition of castellers was born in southern Catalonia, some of its best practitioners today can be found in the capital city. If watching people climb on top of one another is your thing, look no further – this is an unparalleled opportunity to enjoy that art in its purest form.