Portal to the Underworld
- Episode aired May 22, 2015
- TV-PG
- 22m
Ghosts of a bizarre plane crash and a mysterious underground city point to powerful forces at work inside the Grand Canyon National Park.Ghosts of a bizarre plane crash and a mysterious underground city point to powerful forces at work inside the Grand Canyon National Park.Ghosts of a bizarre plane crash and a mysterious underground city point to powerful forces at work inside the Grand Canyon National Park.