Mauna Loa Volcano, HI

The largest volcano on Earth, Hawaii's Mauna Loa has erupted 33 times since its first documented eruption in 1843, but has been relatively quiet since 1984.
(http://news.nationalgeographic.com/news/2010/05/photogalleries/100518-mount-st-helens-americas-most-dangerous-volcanoes-science-pictures/#/most-dangerous-volcanoes-united-states-mauna-loa-hawaii_20367_600x450.jpg)