Evidence suggests that a Nazi officer was replaced by a doppelganger.

Three inmates are said to have escaped from Alcatraz prison, but even today, it's never been proven; new evidence might finally crack this notorious cold case, as experts use forensic science and cutting-edge tech to investigate fresh leads.

Brand-new evidence reveals the secrets of a Nazi program to build a nuclear bomb, and using cutting-edge science and tech, experts uncover classified files that reveal how closer Hitler came to this terrifying superweapon.

Beneath Yellowstone National Park is one of the world's largest active volcanos, and it's poised to erupt at any moment; experts use seismic technology and visual imaging to reveal its catastrophic threat.

A nuclear submarine spying on Soviet maneuvers goes missing, and its wreckage is mysteriously found on the ocean floor; the US Navy claims it was an accident, but declassified documents reveal startling new information that points to a Cold War coverup.

Amelia Earhart's disappearance is one of America's greatest unsolved mysteries. But now, forensic science might finally crack the case, as experts examine human remains that could be proof positive of her whereabouts.

The Shroud of Turin is alleged to be the actual burial cloth of Jesus Christ – but it could be a total hoax; now, scientists use cutting-edge forensic analysis to finally determine the truth behind this astonishing holy relic.

The Scott Antarctic Expedition aspired to conquer the South Pole before anyone else, but this great endeavor of exploration never returned; now, newly uncovered evidence suggests this team may have succumbed to something more sinister than harsh elements.

Adolph Hitler disappears from the world in an apparent suicide at the end of WWII, but theories of his possible escape continue to circulate; experts use cutting-edge forensic science to examine remains that could finally solve the mystery of his fate.

American diplomats stationed in Cuba begin to experience a bizarre mixture of noxious neurological symptoms and seem to be under a mysterious attack; experts use cutting-edge forensic science to determine if a sinister, sonic weapon is at play.