‘Secrets Unlocked’ Preview Monday On Smithsonian Channel

Monday, 5/18

SECRETS UNLOCKED: STONEHENGE MYSTERY (new episode) — 8 p.m. ET/PT

Stonehenge is a 5,000-year-old mystery. Despite years of investigation, archaeologists can’t agree about why or how this stunning and mysterious monument was built. Some argue that one of the world’s most famous monuments, with its careful alignment to the midwinter solstice, was a giant calendar or observatory, or a cathedral to some unknown gods. But now the discovery and dating of an ancient mass-grave at the Stonehenge site is indicating that the site began as a Neolithic graveyard.

Monday, 5/18

SECRETS UNLOCKED: HUNT FOR ATLANTIS (new episode) — 8:30 p.m. ET/PT

The island of Atlantis vanishing beneath the waves is one of the greatest myths of the ancient world. Described by the Greek philosopher Plato, Atlantis was initially thought to be a cautionary fable. But could the lost civilization have been inspired by real events?

Monday, 5/25

SECRETS UNLOCKED: BOG BODIES (new episode) — 8 p.m. ET/PT

Across Europe a series of murder victims lie buried in the earth. 2,000-year old natural mummies, these are the so-called “Bog Bodies.” Today, these remains are revealing shocking tales of human sacrifice in which the victims seem to have willingly met their fates.

Monday, 5/25

SECRETS UNLOCKED: HEADLESS GLADIATORS OF YORK (new episode) — 8:30 p.m. ET/PT

It was one of grizzliest finds in modern archaeology. The decapitated remains of 80 battle scarred skeletons, ritualistically buried 2,000 years ago in the Historic City of York. Could these men be Gladiators? If so, it could rewrite the history of the Roman occupation of Britain.