The three other entrances—at Warner Valley, Butte Lake, and Juniper Lake—are ... and plug dome—can be found in Lassen Volcanic National Park, where they literally bubble and steam.

Lassen Volcanic may not be the most known National ... As it cooled, the lava formed low ridges and gave birth to two lakes: Butte Lake and Snag Lake. The bare branches of a drowned forest jut ...