Embark on an urban exploration of the central section of Diagonal Avenue, a crucial link connecting various neighborhoods of Barcelona. This guided tour, which forms part of a series examining the transformative impacts of Diagonal on the city, offers a historical and urbanist perspective on a sector that has acted as both a boundary and a unifying element since the 19th century. The exploration allows participants to observe how this space has been shaped by conflicts between functionality, representation, and ongoing changes, contributing to the metropolitan project of Barcelona while providing a rich understanding of the city's evolving identity.