Mysteries at the National Parks

In the series premiere, Montana's Glacier National Park is explored for evidence of a secret underground Nazi base that some suspect was the final hideout for Adolf Hitler. Also: UFO sighting reports.

Gettysburg National Military Park in Pennsylvania is investigated for evidence of ghosts, a secret government time travel experiment, and Native American battles.

The fabled chupacabra, which many believe lives in Puerto Rico's El Yunque National Forest, is linked to various UFO sightings and a secret US government research facility in the area.

Unexplained disappearances, a mysterious death and a Karuk Indian legend are linked to a race of superhumans in California's Shasta National Forest.

A Bigfoot-like creature and UFO sightings suggest that California's Joshua Tree National Park may be ground zero for alien genetic experiments.

Believed to be the work of Pele, the fire goddess, black magic, mysterious deaths and violent fireballs haunt Hawaii Volcanoes National Park.

Ghosts of a bizarre plane crash and a mysterious underground city point to powerful forces at work inside Grand Canyon National Park.

A tragic plane crash, shocking murders and a mysterious python infestation suggest a dark, evil power deep in the heart of Florida's Everglades National Park.