The sparkling wines of Champagne have been revered by wine drinkers for hundreds of years, and even today they maintain their reputation for excellence of flavor and character, and are consistently associated with quality, decadence, and a cause for celebration. Their unique characteristics are partly due to the careful blending of a small number of selected grape varietals, most commonly Chardonnay and Pinot Noir. These grapes, blended in fairly equal quantities, give the wines of Champagne their wonderful flavors and aromas, with the Pinot Noir offering length and backbone, and the Chardonnay varietal giving its acidity and dry, biscuity nature. It isn't unusual to sometimes see Champagne labeled as 'blanc de blanc', meaning it is made using only Chardonnay varietal grapes, or 'blanc de noir', which is made solely with Pinot Noir. When it comes to New World wines, and especially wines from the United States of America, Napa Valley is something of a standard bearer. Over its relatively short history, it has managed to transform itself from being a fairly insignificant region, to becoming one of the most important and highly regarding wine locations on earth. With an ideal climate for viticulture, blazing sunshine and a low level of rainfall, this valley is shielded on many sides by mountain ranges which help it maintain a consistent level of heat, light and moisture throughout the year. Today, Napa Valley is a home of innovation and quality, with dozens of grape varietals thriving in the fertile soils. However, the main varietals grown there have always been Cabernet Sauvignon, Chardonnay, Pinot Noir, Merlot and Zinfandel, and the wines they produce are constantly lauded by critics and competitions across the globe.