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Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions. This episode is a mashup of S04E13 and S01E01.
Researchers investigate a strange glowing lake reported to turn things into stone; a structure in Africa that resembles Stonehenge is said to be the resting place of a mythical giant.
A mysterious Stonehenge-like structure in Russia may have links to the Nazis; experts uncover clues to a mega-tsunami with the power to devastate the United States; a huge lake appears in the Sahara overnight.
This season we are exploring some satellite image mysteries in even greater detail, traveling to Argentina to examine a strange settlement locals say was the home of Adolf Hitler and Eva Braun after escaping from Berlin, to a series of bizarre mounds in the wilds of Transylvania that legend claims is connected to the area's most infamous resident, Vlad the Impaler, Dracula himself.