This design for a visitors’ center and gallery proposes a piece of passage architecture for Rome that provides a way for pedestrians to experience the Largo Argentina Site by replacing the existing impenetrable boundary between the modern street level and the lower excavated temples. Working under the premise that Rome can be continually reinvented through the reconfiguration of its spatial prototypes, the design solution is based on the urban stair that ascends the Gianicolo Hill from Trastevere to San Pietro in Montorio including the piazza and the Tempietto courtyard, an apt model for urban navigation across a change in elevation. By identifying the elements of the sequence as purely spatial components, it became possible to re-assemble them at the Largo Argentina into a new experiential narrative of intervals of movement and rest.