https://youtu.be/IyKugvEoZGw?si=9I27t5XfjnBpFbSI The Lake Shasta Caverns are a network of caves located near the McCloud arm of Shasta Lake in California. It was formerly named Chalk Cave and Baird Cave, named after Spencer Fullerton Baird. . The caverns are dated to at least 200 million years, and were formed by flowing water. Over the years this water drained leaving the caverns seen today. Th..