1. You will be a part of a human pyramid on 9/11 and think about this day in a whole new way.
Many associate 9/11 with the 2001 terrorist attacks in the US, but Barcelona has its own significance behind that date. Every year, September 11th celebrates la Diada, Catalonia’s national day, when people wear traditional outfits, host big concerts at Arc de Triomf and compose castellers — tall human pyramids, originating from a traditional dance symbolizing solidarity.