Which National Park Service park contains volcanoes of all four major types?

Lassen Volcanic National Park contains volcanoes representing all four major types: plug domes, shield volcanoes, cinder cones, and stratovolcanoes.

The California park’s namesake, Lassen Peak, is the world’s largest plug dome volcano. Other volcanic features include shield volcanoes, the Cinder Cone, and remnants of the former Mount Tehama stratovolcano. This close combination gives the park an unusually broad volcanic record.

Lassen’s volcanic activity is not merely ancient. A series of eruptions began in 1914, and a major eruption on May 22, 1915, sent ash and volcanic material across the surrounding landscape. Activity continued intermittently through 1917, helping draw attention to the area’s geological significance.

The park began as two national monuments, Lassen Peak and Cinder Cone, created in 1907. It became Lassen Volcanic National Park on August 9, 1916, shortly before the National Park Service itself was established.