Deadly forests, haunted houses, and mountains where visitors never return alive; a look at what constitutes an evil place and whether these locations are imbued with dark energy that is currently beyond understanding.

For centuries, archaeologists have tried to unravel the mysteries of how and why certain incredible structures like the Great Pyramid at Giza, the staircase at Loretto Chapel, and Coral Castle were built.

Probe nature’s weirdest phenomena, from the Windsor Hum to Old Faithful. Visit a Venezuelan lake where lightning rains down 300 nights a year and size up the massive underground fire that’s been burning in Centralia, Pennsylvania, since 1962.

Encounter wild freaks of nature and find out if they’re just figments of the collective imagination. Chase a bloodsucking chupacabra in Texas, then see if humankind’s genetic experiments brought about Goatman, Mothman, and other mythical hybrids.

Learn how specific rituals may connect humans to a higher power. Journey to San Pedro Manrique, Spain, and see festivalgoers transcend pain as they walk over fiery-hot coals, then examine the healing power of practices such as voodoo and exorcism.

See if death is a gateway to new life. Meet a neurosurgeon who fell into a deep coma and emerged with the conviction that near-death experiences aren’t hallucinations, then hear from a retired firefighter who may be a reincarnated Civil War general.