Life After People. One of the last amazing productions of the History Channel as-was, before it became all Ice-Road Truckers, Ancient Aliens and fucking Pawn Stars.
It's just the speculative history of all of what humanity would leave behind if, for some reason, every human disappeared in a single day. With experts in preservation, ecology, geosciences, history and infrastructural engineering, it asks: What are the cascading effects of a worldwide technological civilisation? And how long would it take for everything we have built to be buried in the dusts of time? Look on, ye mighty, and despair.