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, in Season 3, Episode 7, “Marco Polo Discovers America.”

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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, in Season 3, Episode 7, “Marco Polo Discovers America.”