Puente Transbordador Nicolás Avellaneda

This guide to the Puente Transbordador Nicolás Avellaneda in Buenos Aires opens with a naturalist's verdict on the filthy Riachuelo below and the slaughterhouses that fouled it for decades. From there it explains why an ordinary bridge wouldn't work here, and how engineers answered in 1914 with a suspended steel cabin gliding on cables instead of spanning the water. Neighbors said the current sometimes ran red, streaked with blood, long before it ever reached the sea.