In the far northeastern corner of California, Lassen Volcanic National Park is a remarkable reminder that North America is still forming, and that the ground below is alive with the forces of creation and, sometimes, destruction. Lassen Peak is the southernmost in a chain of volcanoes (including Mount St. Helens) that stretches all the way from British Columbia.

Although it’s dormant, 10,457-foot Lassen Peak is still very much alive. It last awakened in May 1914, beginning a cycle of eruptions that spit lava, steam, and ash until 1921. The eruption climaxed in 1915 when Lassen blew its top, sending a cloud of ash 7 miles high, visible from hundreds of miles away. The peak has been dormant for more than three-quarters of a century now, but the area still boils with a ferocious intensity: Hot springs, fumaroles, geysers, and mud pots are all indicators that Lassen hasn’t had its last word. Monitoring of geothermal features in the park shows that they are getting hotter, not cooler, and some scientists take this as a sign that the next big eruption in the Cascades is likely to happen here.

The park gives visitors an interesting chance to watch a landscape recover from the massive destruction brought on by an eruption. To the north of Lassen Peak is the aptly named Devastated Area, a huge swath of volcanic destruction steadily repopulating with conifer forests.

The 108,000-acre park is a place of great beauty. The flora and fauna are an interesting mix of species from the Cascade Range, which stretches north from Lassen, and species from the Sierra Nevada Range, which stretches south. The blend accounts for an enormous diversity of plants: 715 species have been identified in the park. Although it is snowbound in winter, Lassen is a summer feeding ground for transient herds of mule deer and numerous black bears.

In addition to the volcano and all its geothermal features, Lassen Volcanic National Park includes miles of hiking trails, 50 beautiful alpine lakes, large meadows, cinder cones, lush forests, cross-country skiing, and great backcountry camping. In fact, three-quarters of the park is designated wilderness. Lassen is one of the least-visited national parks in the Lower 48, so crowd control isn’t as big a consideration here as in other places.