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Watch History's Greatest Mysteries Season 4 Episode 10 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Awe-inspiring and mysterious, the pyramids of Egypt are among the most significant wonders of the ancient world. More than 4,000 years old, they are among the most celebrated architectural marvels in the world. But no one fully understands how they were built, or why. Can we ever decipher the true purpose of Egypt's astonishing pyramids?