Mount St. Helens, Wash.
Mount St. Helens is best known as the mountain that literally blew its top in 1980, killing 57 people, destroying 250 homes and 185 miles of highway. The eruption took off about 1,300 feet off the mountain's elevation, leaving it at 8,365 above sea level. It's the deadliest and most economically devastating volcanic eruption in the history of the United States and it literally flattened about 230 square miles of ground. The Mount St. Helens you see on Google Earth today is a vastly different one than the one before the blast.
Google Earth coordinates:
46° 09'16.56" N, 122° 12'14.62" W