Lassen Volcanic National Park is a popular destination for hiking ... Death Valley is in the middle of the desert and is home ...

Four types of volcanoes—shield, composite, cinder cone, and plug dome—can be found in Lassen Volcanic National Park, where they literally bubble and steam.

The Lassen Peak hike is one of the most difficult hikes in Lassen Volcanic National Park, with a nearly 2,000-foot elevation gain in the first half of the five-mile hike. The end result?