Mauna Loa, Hawaii
Mauna Loa is one special volcano. It is the largest one ever known. It has been erupting on a regular basis for the last 700,000 years. The main concern about it is its continuous flow of lava. The good thing is that the lava flows at a very slow pace. Unfortunately, this will spell huge disaster if it combines with a major explosion. If this happens today, the highly populated city of Hilo might get a direct hit.
