Seville Cathedral is the largest Gothic church in the world. It's a distinction earned when the medieval chapter resolved to build something "so large that those who see it finished will think we were mad." It rose on the site of a 12th-century Almohad mosque. The Giralda tower still bears the mosque's DNA: an antiseismic foundation so well engineered it has survived nearly 900 years of earthquakes without a crack.

Inside, Columbus's remains are interred after a posthumous journey from Valladolid to a monastery to Santo Domingo and finally back to Seville. The cathedral's founder, Ferdinand III, lies in a silver Baroque urn still opened four times a year.

VoiceMap's self-guided audio tours trace the cathedral's role at the heart of Spain's colonial empire. They connect its Orange Tree Courtyard to the merchants who conducted New World deals there, and explaining why Christ expelling the money-changers was carved above the gate.