Because of this, the serpent was a highly respected animal in ancient Greece and figured prominently in mystery cults. Even the mother of Alexander the Great was said to keep serpents as pets and was rumored to have been seduced by Zeus in the form of a snake.
The second great explosion formed the Island Park caldera 1.3 million years ago. This caldera, the smallest of the three, lies just west of Yellowstone in Idaho, within the western part of the Huckleberry Ridge caldera. The youngest caldera, Lava Creek, erupted the Lava Creek Tuff, 0.65 million years old.
by Stephen Oppenheimer. Toba Lake in northern Sumatra is the world's largest active volcanic caldera. The volcanic eruption that resulted in Lake Toba (100 x 30 km) 74,000 years ago, is known to have been by far the biggest eruption of the last 2 million years.