Here's a structure that won't provide shelter from and is only marginally better when it comes to the midday sun. So, why build it? Because in the absence of walls and a roof, it defines an outdoor space without constraining it. It's a unique architectural blend that places you both inside and out at the same time. The structure is called a pergola, and it's just the thing to bring backyard landscaping to life. Pergolas wer features of Italian Renaissance gardens, often covering walkways or serving as grape arbors. Today, the same design can be used to define a passageway or frame a focal point in yard. Add a climbing plant such as wisteria or, yes, grapevines, and your pergola will provide and shade as well.