The famous Basilica of Barcelona has been completed and this architectural jewel has fascinated architects for 140 years. The construction site has been relaunched over the last fifteen years, notably around the erection of ten additional spires that dominate the building. This work allows us to dive back into the creative process of Gaudi by restoring his sources of inspiration and his obsessions, through fiction and thanks to 3D technologies. If the work is to be completed in 2026, the date of Gaudi’s centenary, many obstacles remain to be overcome.