If you ever been driving past Camelback Mountain or Piestewa Peak, you may have looked out the car window and seen a house perched along a ridge. From the road it looks as if it's almost built into the mountain.But in reality it's built beside the mountain. The process is costly and arduous, but wanting an unrestricted view of the Valley is a trend that's nearly 100 years old. And even before it was a trend, it was a necessity to build up into the mountains.In this week's episode of Valley 101, a podcast from The Arizona Republic and azcentral.com, we find out the history of mountainside houses and how they're built.Learn more about your ad choices. Visit megaphone.fm/adchoices