7 dormant volcanoes you may not know about

Beautiful on the outside, these sleeping giants may one day awaken with destructive power.

2 / 8
2 / 8

Mount Hood, Oregon

The state of Oregon's highest point (as well as one of the United States' loftiest peaks) at 11,249 feet, Mount Hood has erupted at least four times in the past 15,000 years. The last eruption was in the late 1780s, with the famed Lewis and Clark expedition in 1805 recording evidence of its impact.

While the odds of an eruption in the next 30 years are less than 10 percent, scientists have nonetheless recently recommended installing four additional volcano monitoring stations on the upper flanks of the mountain. With frequent earthquakes and releases of steam and volcanic gases, Mount Hood is something of a light sleeper.

Photos and SlideshowsPhotos and Slideshows