Show me...

This northern California mountain hasn’t rumbled since 1921, five years after it gained National Park status, but it has centuries of tumultuous activity to thank for its signature features: fuming vents, hot springs and the red-tinged Painted Dunes dotted with snow algae, pine trees and other soaring conifers. Geologists have discovered each of the four main types of volcanoes within Lassen Volcanic National Park's 106,372 acres: Prospect Peak typifies the shield style; Lassen Peak itself is a plug dome; Cinder Cone is named for its category; Mount Tehama represents the composite form.