America Unearthed: Ancient Ruins Discovered in California (S3, E7) | Full Episode | History
Just east of the San Francisco Bay Area are the Berkeley Hills Walls--remnants of a massive, stone wall that stretches a distance of over fifty miles. See more in Season 3, Episode 7, “Marco Polo Discovers America.“
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America Unearthed: Ancient Ruins Discovered in California (S3, E7) | Full Episode | History