“For Humboldt, the question had been, ‘Why are there regional variations in nature?’ For the person standing before the Iglesia de San Francisco el Grande, the question might be, ‘Why have people felt the need to build churches?’ or even ‘Why do we worship God?’ From such a naive starting point, a chain of curiosity would have the chance to grow, involving questions such as ‘Why are churches different in different places?’, ‘What have been the main styles of churches?’ and ‘Who were the main architects, and why did they achieve success?’ Only through such a slow evolution of curiosity could a traveller stand a chance of greeting the news that the church’s vast neoclassical facade was by Sabatini with anything other than boredom or despair.”