19K views · 93 reactions | To celebrate the reboot of Unsolved Mysteries, we broke down the history of the series, including some of the most interesting cases profiled on the show. | Mental Floss | Facebook

In the 1970s, a fire in the basement of Russia’s Fort Zverev—where a napalm-like substance was stored—burned so intensely that the bricks melted, creating a surreal, fiery-red cave with dripping brick stalactites that resembled a frozen inferno. | Unsolved Mysteries & Paranormal Activities