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Watch Horizon Season 39 Episode 4 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Horizon: The discovery of a 5,000-year-old city of pyramids in the Peruvian desert, believed to be the fabled missing link of archaeology: The Mother City : which answers major questions about why human beings first formed civilisation. Caral, as the city is known, has no battlements or weapons : all findings point to a lifestyle based on commerce and pleasure : quashing the previous theory that warfare was the key force common to complex societies.