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Strange relics forgotten by time, including familiar stone monoliths in Colombia, a lost city in Sierra Nevada and ancient ruins in Greece and Malta.
An investigation of significant historic and contemporary sites from the revealing vantage points of drone, satellite, and aerial photography.
Visions from above, including a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert and mysterious multicoloured pools across northern Ethiopia. Plus, a huge human figure hidden in the Australian Outback.