Old Faithful Geyser of California, located in the scenic Napa Valley, is said to be one of the only three old faithfuls in the world. The geysers get such a name because they erupt at regular intervals and have a predictable pattern. Scalding water (around 350 degrees F) shoots high in the sky, in this natural occurrence. This one put out a spectacular show every 15-20 minutes while we were there. The mountain in the background is Mt. St. Helena.