Antoni Gaudi looked at the straight line and decided nature had no use for it. He built the Sagrada Familia, Casa Batllo, and Park Guell using curves, organic forms, and structural innovations that engineers are still working to understand. He died after being struck by a tram, so poorly dressed that bystanders mistook him for a beggar.

This episode traces Gaudi from his Catalan childhood through his apprenticeship in Gothic architecture, his radical departure into organic design, and the unfinished cathedral that remains his masterpiece over a century after his death.

• The Sagrada Familia has been under construction since 1882 and remains unfinished more than a century later
• He was struck by a tram in 1926 and died unrecognized because his appearance was so disheveled
• Seven of his works are designated UNESCO World Heritage Sites
• He devoted the last twelve years of his life exclusively to the Sagrada Familia, living on site as a virtual recluse