Archaeologists discover human remains during an excavation of a fifth-century fort on the Swedish island of Oland. After further investigation, experts unearthed 26 skeletons and uncover the site of an ancient massacre

Yttygran Island in the easternmost tip of Russia is home to the Whale Bone Alley, a 550m stretch of land where giant whale bones and skulls dot the landscape like strange, ancient standing stones.

Climbers make a shocking discovery when they encounter the remains of two human bodies high atop New Zealand's Mount Cook. After a forensic investigation, a decades-old mystery reignites that could rewrite mountaineering history.

Experts and scientists expose more dark secrets, forgotten treasures, and lost relics from some of the coldest places on Earth.

Archaeologists make a grim discovery when they uncover the remains of a mummified boy buried in the frozen Siberian landscape, and as researchers continue their excavation, they uncover 88 additional graves linked to a mysterious, ancient necropolis.

Mountain climbers in California find the body of a US Army soldier, strange bundles of canvas and wood are discovered on an Alaskan mountain and volcanic glass is found in an unexpected place. A vital Second World War weather station is uncovered.

Archaeologists discover an unusual man-made rock formation in the remote Altai Mountains of Russia, and conducting a further excavation, unearth an ancient log cabin and the mummified remains of two bodies buried deep in the frozen permafrost.

An unidentified metal object is found on Kiska Island, while a centuries-old gold mining mystery is investigated. In Siberia, a network of ice tunnels is explored, while fossils unearthed in the Canadian Arctic lead to the discovery of a new species.

Preserved in the ice of Mexico's highest peak, a group of climbers stumbles upon the bizarre, mummified remains of a man in a pinstripe business suit. Experts uncover possible drug cartel connections and a plane crash shrouded in secrecy.

A salvage team discovers the mysterious remains of an enormous shipwreck near Cambridge Bay in the icy waters of the Canadian Arctic. Experts investigate and uncover a cutting-edge vessel with links to one of the greatest polar explorers in history.