Here you'll find everything from sea caves off the Channel Islands and La Jolla to ancient lava tubes of dorment volcanoes. Many of California's caverns contain stalactites and stalagmites and vary in size with some being as tall as the Statue of Liberty and others containing underground lakes. California also has a few mines that offer underground tours to the public and some are active mines that welcome you to take your findings home. Whether you're a spelunker, treasure seeker or just interested in going underground, California has something to suit your interest. Most caves and mines hover around 60 degrees year round, making these underground attractions a great place to cool off on a warm summer day.