East Bay Walls

The East Bay Walls, also known as the Berkeley Mystery Walls, are a misnomer, as many such walls can be found throughout the hills surrounding the San Francisco Bay Area, and extend as far as Chico, Red Bluff and Montague. In places, they are up to a meter high and a meter wide and are built without mortar. The walls extend anywhere from a few meters to over a half mile. Materials range in size from basketball-size to sandstone boulders weighing a ton or more. Parts of the wall seem to be just piles of rocks, while other walls were carefully constructed. The exact age of the walls is unknown. Many formations have sunk far into the earth, and are often completely overgrown.