Reconversion of Universal Expos’ Ex-Sites, an Urban Project for Seville

The capacity of exhibitions to transform a city extends over a long period. The expo area is converted into a unique scenario for architecture, diversity, technology, mobility, and culture during the event itself. After the exhibition is over, work continues with the architectural transformations necessary to reconfigure the place into one that responds to the needs of the city and its inhabitants. The collateral actions of urban development through exhibitions involve the regeneration of different areas of the city, such as emblematic areas, and the reconfiguration of its operational systems such as transport, telecommunications, various networks, etc. Universal Expositions have historically served as catalysts for large-scale urban transformation, leaving behind complex spatial, architectural, and infrastructural legacies. However, the long-term integration of former expo sites into the contemporary city remains uneven and insufficiently documented, particularly in the case of Seville, which hosted both the 1929 Ibero-American Exposition and the 1992 Universal Exposition. This research employs a mixed qualitative methodology combining archival investigation, cartographic and photographic analysis, field observation, and research by design. Based on these findings, the paper presents an original architectural and landscape intervention for the degraded area of Isla de la Cartuja, proposing a multifunctional center and botanical garden, a recreational complex that reactivates an abandoned section of the former American Garden. This study contributes to worldwide discussions on mega-event legacies by offering a structured post-expo evaluation framework, identifying lessons for future regeneration processes, and demonstrating how research by design can support the sustainable transformation of such a former event landscape.