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, in Season 3, Episode 7, “Marco Polo Discovers America.” #AmericaUnearthed
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In “America Unearthed,” host Scott Wolter uses hard science and intuitive theories to explain the most mysterious artifacts and sites in America.

HISTORY® is the leading destination for award-winning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platforms. The network’s all-original programming slate features a roster of hit series, premium documentaries, and scripted event programming.


  1. The map of China shows the Ming fleet leaving from Beijing. The fleet actually left from Nanjing, the capitol of China, which is located up river from Shanghai. History Channel can't even write a map correctly.

  2. You clicked baited with me making me think of The City of Gold, but then preach your communist dribble instead. I am never watching one of your videos ever again. And to think, I used to buy into your magazines as the most coolest thing to get in the mail. I am so mad, words cannot express how betrayed I feel. Never again, you lost my trust.

  3. I think they were made when the king of Spain expanded into northern America. They were probably forming rock barriers to protect themselves from Indians and the US carveries.

  4. There are called range walls and they are somewhat common in the American Southwest. They are associated with ranching and in California can date as early as the 1830s.

  5. Why would sea farers not just follow the Asiatic coast north. Eventually they could follow the Aleutian islands, which were down by the Aleuts, to what is now Alaska. Seems ridiculous that this never happened. AS to Columbus, he knew about the Americas. He must have otherwise he would not have taken the route he did.

  6. Okay, so white folks, again, misinterpreting history, because they REFUSE to accept the FACT that AMERICA has an INDIGENOUS population that built high civilizations and cultures without any OUTSIDE influence, and that AMERICANS went out into the world not the other way around, as the gradual evolution of civilization and cultures show. They need to stop telling other people's history. This is why racism exists, and so many folks are loss of who they are, including those who today call themselves, though erroneously, JEWS and WHITE.

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