Ammo Bunker (2009) is a multipart installation that includes large-scale wall prints and an architectural model. The work takes as its departure point the history of Wilmington, Ybarra’s native hometown in southern Los Angeles. The piece refers to a Civil War era ammunition store that Ybarra found at the heart of the harbor close to Long Beach. The facility was later used as a temporary prison to hold different people coming from Mexico to Los Angeles during the Civil War. The building’s walls are covered with different marks and inscriptions from that time—what Ybarra likes to call L.A.’s earliest graffiti and which today coexist with recent gang tags. By pointing out the presence of these two kinds of inscriptions in the same historical place, Ybarra furthers his investigation into the intertwining of Mexican-American and Anglo-American social and cultural histories in Southern California.