The East Bay Walls, also known as the Berkeley Mystery Walls, are the rough walls and rock lines surrounding the San Francisco Bay Area of ​​California. It is still unknown who built these walls.  

The walls are made of stacked stones of various sizes, built without mortar, reaching a height of up to five feet (1 foot = 0.3 m). Most of the walls are about three feet wide and stretch in sections from a few feet to more than half a mile and are located in unlikely and inaccessible places. The stones used for their construction range in size from a basketball to large sandstone boulders weighing several tons. The walls themselves are not all the same - some are built in long straight lines, while others form arcs, rectangles or circular shapes. Elongated lengths of large stones can be found along the entire length of the wall, some stacked, some loose. In some places parts of the wall are built carefully, while in others it looks just like a pile of stones. Some heavy stones have sunk deep into the ground and are overgrown with vegetation. The wall is not continuous or high enough to act as a fence or protective wall.

So far, it seems that this mysterious structure has not yet attracted the attention of archaeologists, as well as a number of other well-preserved structures located in America, the exploration of which could tell a lot about what was happening on our planet. Foreclosure geologist Scott Wolter, who said after the first examination of the large building, said: "I can't believe that such a large wall, which stretches 50 miles along the California landscape, escapes the attention of today's archaeologists." in places it measures about eight feet and reaches underground. Based on a study of the layers of stone, he stated that they had been in place for at least 200 years. Other testing of lichen on stones, however, suggests that the wall could be much older. 

Who built the mysterious walls of the East Bay?

The Spanish settlers who arrived in the area confirmed that the walls were already there before their arrival, and when they asked the local American Indians Ohlone, they said the same thing.

Naturally, the simplest explanation for the wall would be that it was built by Native Americans. If so, what purpose would it serve? It is remarkable that the construction of such walls does not seem to be something that the local tribes would usually do. Why would they need such a long wall. One theory is that they built mysterious walls Lemurs  z  of the mythical island of Mu.   Stories about Lemuria became popular in 1864, when British zoologist Philip Lutley Sclater suggested that lemurs from Madagascar came from a lost land in the Indian Ocean.

Early 20th century professor of chemistry at the University of California Henry Coffinberry Myers  attributed the construction of the wall to Chinese migrants. After excavating the cave, he discovered various objects, including stone axes, a large flat stone table, a clay jug, and a five-faced stone painting, concluding that they were artifacts at least 1000 to 10000 years old and evidence that giants lived in california and the mysterious walls are their work.

However, the construction of the wall was also attributed to the Chinese, who are famous for their construction of the walls, with the most famous example completed during the Ming Dynasty being the Great Wall of China. As early as 700 BC, the Chinese used the Wild Walls to monitor and warn of approaching enemies. Should the enemy appear, they lit a fire and gradually passed on signals of imminent danger. The Chinese already had in the 11th century. strong naval fleet and the question is whether they could reach California. 

Wolter is trying to prove that this would be possible when, in an interview with anthropologist Dr. Gunnar Thompson discusses incredible Chinese expeditions during the Ming Dynasty. According to Thompson, explorer Admiral Zheng He commanded more than 200 ships on seven ocean expeditions during the Ming Dynasty (the golden era of Chinese history). From 1405 to 1433, Zheng He explored a wide area from the Chinese coast to the African coast, at least 11 miles. In the survey, they compiled maps of what they had discovered. Indeed, maps indicate that they have circumnavigated much of the globe and may have gone far beyond Africa. According to Thompson, one map shows North and South America. Which could mean that the Chinese got to California and they could be the ones to build the walls.  

However, there is still no written documentation that contains information about when and by whom the walls were built and what they were used for. And so there is only speculation about the reasons for their construction and their importance, from cattle pens, land borders, through cult purposes to navigational aids used by aliens. We will have to wait for answers to these questions until the walls attract the attention of archaeologists.