Lassen Volcanic Center, California: Number 7 of America's Ten Most Dangerous Volcanoes

It might be slightly unfair to single out Lassen Peak (pictured), since the Redding, California-area volcano (map) is simply one among several volcanoes in a volatile cluster.

"The next eruption might not be on Lassen Peak," said the Cascades Volcano Observatory's Scott. The blast could take place at a neighboring volcano—or create a new one altogether.

Lassen Peak last erupted during between 1915 and 1917. Like Mount St. Helens 30 years ago, the California volcano blew down a patch of forest, but on a much smaller scale. The previous eruption in the area—called the Lassen Volcanic Center—in the mid-17th century formed a new volcanic cone about 10 miles (16 kilometers) east of Lassen Peak. Source