Lassen Peak is a 27,000-year-old youngster formed by lava pushing up from the ground. The mountain exploded in 1915, sweeping away trees, hurling boulders, and sending a column of ash 6 miles into the sky. The volcano rumbled for several more years, then fell quiet. Lassen Peak was the most recent big volcanic eruption in the continental United States before Washington’s Mount St. Helens blew its top in 1980.
My favorite feature at the park is a secluded volcano named Cinder Cone in the northeast corner. The one-hour drive from Manzanita Lake goes outside the park’s borders to a gravel road cut six miles through a pine forest. It’s tempting to say Cinder Cone is in the middle of nowhere, but that implies a central location. It’s on the outskirts of nowhere.