The Sagrada Família is almost complete - but why did it take 144 years? As Pope Leo holds mass at the church and inaugurates its tallest tower on the 100th anniversary of the death of the church’s architect Antoni Gaudí, we speak to Tristram Carfrae and Steve McKechnie, the structural engineers behind the Sagrada’s finishing touches, who explain why it’s taken so long to build. #Gaudí #SagradaFamília #c4news