Its scaffolding-cloaked spires reach up to the heavens, dominating the Barcelona skyline and drawing in millions of visitors every year. What seduces our attention is perhaps a combination: not only its almost megalomaniac ambition and architectural extravagance but the sheer longevity of its construction. Its creator, Antoni Gaudi, 'God's Architect', saw the first stone laid on 19 March 1882 and yet it is unlikely to be completed until 2026 at the...