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Science Channel

Aerial archaeologists capture bizarre, spider-like markings etched deep into the mountains of Northern Spain; experts investigate an ancient site that contained one of the largest and most important gold mining operations of the Roman Empire.

What on Earth?

Ancient Rome's El Dorado

Aerial drone imaging captures clusters of enormous, perfectly round holes scattered along the coast of the Dead Sea in Israel; experts reveal a history of destructive water diversion linked to massive sinkholes devouring the region.

Holes of Dead Sea Destruction

Satellite images capture a series of enormous zigzagging patterns carved into the remote woodlands of Poland; experts investigate a clandestine Nazi base linked to a doomed operation that played a pivotal role in the downfall of WWII Germany.

Poland's Secret Nazi Compound

Aerial drone imaging captures oddly shaped industrial-sized towers mysteriously situated in a forest clearing near Moscow; experts investigate a lost Soviet era military compound and the development of a catastrophic electromagnetic weapon.

Russia's Lightning Lab

Satellite images capture two conjoined circular structures embedded in the landscape of Ireland; experts investigate an ancient site linked to legendary figures and the elusive hunt for the Ark of the Covenant.

Circles of the High Kings

Satellite images capture a triangular castle-like tower located on the Mediterranean island of Sardinia; experts investigate the relics of a declining ancient civilization that may have suffered a celestial catastrophe.

Riddle of Sardinia Tower

Satellite images capture monumental ruins surrounded by bizarre feather-shaped structures on a Welsh mountaintop; experts investigate a hidden tunnel containing the remains of an abandoned slate mine with an exploitative and deadly past.

Mystery of the Welsh Mine

Satellite images capture bizarre structures fenced within a remote mountaintop complex on the Greek island of Kefalonia; experts investigate and discover a network of massive satellites linked to a hidden NATO doomsday communications bunker.

Doomsday Lair of Greece

Satellite images capture a bizarre industrial complex in the remote desert expanse of Kazakhstan; experts investigate and uncover a massive hangar containing the most expensive spacecraft in the history of Soviet-era space exploration.

Secret Soviet Spacecraft

Modern imaging technology and analysis from military and intelligence professionals, as well as leading scientists, investigate mysteries from strange geological occurrences to weird man-made structures as seen by more than 4,000 orbiting satellites.

S11 E10 | Ancient Rome's El Dorado