Another stop from this past weekend was at Castle Crags, which is located off I5 between Redding and Weed, California. Soaring above the upper Sacramento River Valley are the sky-scraping spires of granite called the Castle Crags. The Castle Crags were formed in much the same manner as nearby Mt. Shasta and the other peaks of the Cascade Range—by volcanic activity some 200 million years ago. For the last million years, the Crags have been subjected to the forces of wind, rain, ice and even some small glaciers, which have shaped the granite into its distinctive shapes.