La Boca's conventillos — the zinc-clad tenements that housed Italian dockworkers from the 1880s — were never painted in carnival hues until artist Benito Quinquela Martín returned from Paris in 1936 with surplus ship paint and a vision to transform Caminito into an open-air gallery. The corrugated metal façades, originally left bare or rusted, became canvases for a colour palette dictated by marine surplus: ochre from hull primers, cobalt from naval blues, crimson from anti-fouling coatings. What began as utilitarian recycling became Argentina's most photographed street, declared a pedestrian museum in 1959 and now anchoring every la boca free walking tour buenos aires operator's route map. The barrio's tango lineage predates its visual identity by three decades. In the 1880s brothels and pulperías along the Riachuelo waterfront became laboratories for the genre, where Italian immigrants, Afro-Argentine candombe dancers, and gaucho milonga rhythms fused into the earliest tangos. Carlos Gardel never lived in La Boca — that myth belongs to tour-guide invention — but the Usina del Arte, a converted power station three blocks south of Caminito, now archives the distrito's 140 years of recorded tango history, including wax cylinders from the genre's first golden age. Guided neighbourhood tours through La Boca typically anchor at the corner where Juan de Dios Filiberto composed "Caminito" in 1926, inspired by a stream that once separated the shantytown from the wealthier Barracas district to the west. Beyond Caminito's five-block tourist core, La Boca remains a working-class barrio of 46,000 residents, many descended from Genoese sailors who established the República de La Boca in 1882 — a short-lived autonomous state dissolved by federal troops after eleven days. The Bombonera, Club Atlético Boca Juniors' stadium, dominates the skyline three blocks inland, its steep stands visible from the Vuelta de Rocha harbour bend. Free walking tours typically navigate from the Caminito street museum to the Proa Foundation contemporary art space, a converted warehouse overlooking the Riachuelo whose exhibitions rotate every sixteen weeks. The river itself, once South America's most polluted waterway, has undergone partial remediation since 2016; guided walks now incorporate the ecological recovery narrative, pointing to the return of kingfishers and herons along the embankment. The barrio operates on tourist cycles: mornings before 11:00 see local life — fishermen at Vuelta de Rocha, schoolchildren crossing Plaza Solís — while midday through late afternoon transforms Caminito into a corridor of tango demonstrations, craft stalls, and tour groups numbering fifty participants. Evening visits after 17:00 require heightened caution; most operators conclude routes by 16:30, when natural light begins to fade and side streets empty of foot traffic.