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 at least 200 million years, and were formed by flowing water. Over the years this water drained leaving the caverns seen today. The caves are made entirely of limestone, and feature every type of possible formation, including stalactites, stalagmites, soda straws, columns, and flowstone. The Discovery Room, one of eight known rooms in the cavern system, contains all types of limestone rock formation.
Today, the Lake Shasta Caverns attract thousands of visitors every year. Currently, the only transportation to the caverns from the visitor center is a short ride on a catamaran across Shasta Lake, followed by a scenic bus ride up a steep mountain grade. The bus ride terminates at the cavern entrance.