Six striking houses in California's Silicon Valley

While commonly known as a tech hub, Silicon Valley is home to a number of impressive residential designs. US reporter Bridget Cogley picks out six stand-out homes in the area.
About an hour-and-a-half drive south from Downtown San Francisco, Silicon Valley comprises over a dozen cities home and is best-known as the setting for the vast headquarters of Google, Facebook and Apple.
From the charming, tree-lined streets of Palo Alto to more rugged properties, the region also has a range of hous