In Puerto Rico, the iconic Arecibo Observatory, a radio telescope nestled into a giant crater, had to close in 2020 after suspension cables holding up a critical 900-ton platform came crashing into the 305 m dish. Experts analyze the cumulative effects that led to the collapse of this awe-inspiring structure, which has been operational since 1963.

On a snowy morning in Pittsburgh, Pennsylvania, in 2022, a messy commute becomes dangerous when the Fern Hollow Bridge collapses. An investigation reveals how corrosion and other environmental factors contributed to the collapse of this decades-old structure.