In this replay episode: On a beautiful summer morning in 1908, a massive explosion hit Siberia. It downed 80 million trees and lit the night sky 3,000 miles away in Sweden. But to this day, no one knows what caused it.

The Backstory: The Islands Where Millionaires Went to Disappear
10:19

The Backstory: Walt Disney: How Desperation Led to a Billion Dollar Mouse
10:30

The Backstory: Surviving an Apocalypse in Pure Luxury
08:46