From the Texas side of the Rio Grande, a lone car inches across the steel lattice truss of the International Bridge linking Del Rio, Texas to Ciudad Acuña, Coahuila — the Mexican flag and a cluster of pastel buildings visible at the far end, the river glinting below. This Mexfotocolor chrome freezes a quintessential mid-century border-crossing moment: the bridge that served as the sole land link between these twin cities, a crossing that saw generations of American tourists heading south for cheap dentistry, leather goods, and cold cerveza, and Mexican workers heading north. The card is unused and unaddressed, a pristine souvenir likely bought at a curio shop on either side of the bridge.