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Lassen Volcanic National Park is the center of a series of bizarre encounters with sentient reptiles known as reptoids; experts believe these beings are working with extraterrestrials to take over the human race using mind-controlled human agents.

Mysteries of the Outdoors

Reptoid Conspiracy

Visitors to Great Sand Dunes National Park have been seeing strange lights there since the 16th century, but in recent decades, animal mutilations and other bizarre incidents may be evidence the area is a gateway for an alien civilization.

Creature Carnage

Pennsylvania's Gettysburg National Military Park appears to be a place of unusual and mysterious power, giving rise to ghost sightings, evidence of Native American battles and stories about a secret government time-travel experiment.

Haunted Battleground

Sightings of the fabled chupacabra in Puerto Rico's El Yunque National Forest may be linked to UFO sightings and a secret U.S. government research facility.

Chupacabra Island

California's Mount Shasta National Forest has inspired stories about super humans, which may be linked to Karuk Indian legends as well as unexplained disappearances and a mysterious death.

The Land of the Lost

A secret underground Nazi base may be the reason for UFO sightings in Montana's Glacier National Park, which may have been Adolf Hitler's final hideout.

Nazi UFOs

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

Ape Man and Aliens

Hawaii's Volcanoes National Park is haunted by black magic, mysterious deaths and fireballs; some believe these mystifying happenings are the work of Pele, the fire goddess.

Firestarter

A demonic truck driver, disembodied voices, nightmarish skinwalkers and a time loop count among the bizarre phenomena found in Canyonlands National Park, where the mineral quartz may act as a recorder of human experience.

No Man's Land

The shimmering waters of Crater Lake National Park captivate visitors, but they may also be the epicenter of dark, sinister forces from Native American lore that lure visitors to their deaths, concealing a terrifying monster.

Deadly Waters

Experts believe the ghost and UFO sightings, mysterious disappearances and a prehistoric pterodactyl are caused by a rift in the fabric of time in Yosemite National Park.

Without a Trace

The ancient Anasazi built Chaco Canyon National Historical Park, but now the area is stalked by shape-shifting creatures and visited by time travelers who left behind a mysterious artifact.

Cosmic Gateway

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North America's outdoor country is a hotbed for mysteries and the unexplained; there have been hundreds of true tales reported by people every year, and through eyewitness accounts, the hidden stories of these beautiful locales are revealed.

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Mysterious lights, mechanical sounds from deep within the Earth and the disappearance of dozens of aircraft over the Great Smoky Mountains National Park could be evidence of a powerful secret society with an underground base in the area.

S1 E7 | Subterranean Secrets