East Bay Walls
Coordinates: East Bay Walls are also known as the Berkeley Mystery Walls. These crude, stone walls are located in the San Francisco Bay Area in California. In places, they are up to a meter high and a meter wide; the walls run in sections anywhere from a few meters to over a half mile long. The rocks used to construct the East Bay Walls are a variety of sizes. Some are basketball-sized rocks, while others are large sandstone boulders weighing a ton or more. Parts of the wall seem to be just piles of rocks, but in other places it appears the walls were carefully constructed. The exact age of the walls is unknown, but they have an old appearance. Many of the formations have sunk far into the earth, and are often completely overgrown with different plants.
The purpose of these walls is still unknown. Since the wall is not continuous and is composed of multiple sections, they could not have been used as a fence. They are not tall enough to have been used as defense mechanisms. The walls function is unknown as well as the constructors.
The Ohlone Indians have been considered most likely to be the builders, although they were hunter-gatherers and are not known to have built permanent structures. The Mongolians also have been suggested as the source for the walls; in 1904, UC-Berkeley Professor John Fryer suggested that the walls were made by migrant Chinese, who traveled to California before the Europeans. Some specialists have noted that the walls look similar to other ancient structures found in rural Massachusetts, Vermont, and Maine. No evidence has been found to provide an answer to who built these mystery walls.
The East Bay Walls are accessible in several area parks, including Ed R. Levin County Park  in Santa Clara County and Mission Peak Regional Preserve  in Alameda County. The walls are found in the east bay of San Francisco.
- "Stone walls at Ed Levin County Park". 2007-07-11. Retrieved 2013-04-23.
- "East Bay Walls of CA". 2010-10-04. Retrieved 2013-04-23.
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