Cinder cones are the smallest and simplest type of volcano. But that doesn't mean they can't pack a punch. Best described as steep, conical hills, cinder cones are formed by pyroclastic rock ...

Expansive lava flows in the Sáttítla Highlands was captured by satellites ahead of the recent designation of the area as a national monument.

If you can stay longer, climb Cinder Cone, an outstanding example of the results of volcanism, and, if you have the stamina for a more demanding trek, try Lassen Peak. Four types of volcanoes ...

To climb Wizard Island is to climb a volcano within a volcano. Wizard Island is a cinder cone that was created from several minor eruptions at least 900 years ago, while the lake level was rising ...