The Real, True Story of the Mystery of the East Bay Walls | Bay Curious

"Who built the East Bay mystery walls? They appear to be ancient, many hundreds or even thousands of years old." Little is known about the rock walls, found in fragments from the Berkeley Hills clear down to the high ridges above Fremont and San Jose. With little in the way of hard facts about the East Bay walls, people have filled those gaps with all sorts of fanciful theorizing over the last 120 years. But here, alas, is the real story. Reporter: Dan Brekke Video: Adam Grossberg