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It’s a piece of detail only a loving eye would notice: the six-metre-long gold-plated finial rising from the marble dome of Humayun’s Tomb in Delhi shines brighter these days. Fortunately, this 16th-century monument, a UNESCO World Heritage site, attracts many loving eyes, and in the past two years, they’ve seen it blossom under the attention of squads of technicians, workmen and craftsmen. These drones have removed the dead weight of one million kilos of concrete from the mausoleum’s roof, mounted scaffolding to repair its splendid double dome and lifted giant quartzite stones to restore its imposing plinth.