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.

In Glasgow, Scotland, not one but two disastrous fires in 2014 and 2018 ravaged the distinguished Mackintosh Library, which opened in 1909. The fires destroyed thousands of rare books, journals, and archives. The celebrated architect Charles Rennie Mackintosh designed the library, located at the world-renowned Glasgow School of Art. Experts explore how outdated construction methods and materials contributed to the vulnerability of this esteemed place of learning.