There are three types of volcanoes: active volcanoes that frequently erupt, dormant volcanoes that were once active but have not erupted in a long time, and extinct volcanoes that are not expected to erupt again. Kilauea in Hawaii is the most active volcano in the world, constantly erupting and expanding the island. Mount Fuji in Japan is a dormant volcano that last erupted in 1707. Vesuvius in Italy was responsible for a catastrophic eruption in 79 AD that buried the city of Pompeii in ash, preserving it to be excavated and reveal details of ancient Roman life.