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

The fabled Chupacabra in Puerto Rico's El Yunque National Forest may be linked to UFO sightings and a secret US government research facility in the area.

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

A secret underground Nazi base may be the reason for UFO sightings inMontana's Glacier National Park. It may also be the final hideout for Adolf Hitler himself.

Black magic, mysterious deaths and violent fireballs haunt Hawaii's Volcanoes National Park. Many believe this is the work of Pele, the fire goddess.

Ghost sightings, a secret government time travel experiment and Native American battles suggest that Pennsylvania's Gettysburg National Military Park is a place of unusual and mysterious power.

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