Mysteries of the Abandoned: Hidden America - Season 4 Episode 5 -
The Vermont Doomsday Gun
A research facility spawns new technology with earth-shattering implications; a coastal haven for African Americans changes the nation; a forgotten fortress fights off a Nazi submarine; a staunch building stands firm on San Francisco's darkest day.
Please explain the problem in a few words.
Max 255 characters.
Max 255 characters.