'Flexing their power': how America's richest zip code stays exclusive

Atherton, California - home to Silicon Valley heavyweights like Eric Schmidt and Nick Clegg - isn't technically a gated community. But its laws create walls of their own

If fences make good neighbors, then Atherton, California should be full of good neighbors.

In America's most expensive zip code, an abundance of wrought-iron fences, sturdy brick walls and towering hedgerows abound. Some gated mansions sit in gated neighborhoods that sit behind barricades of large oak trees - veritable fortresses fortified with everything but a moat.