Cave Dragons in Yellowstone National Park?? Sure enough, there have been legends dating back centuries of fire-breathing beasts residing in the volcanic underground of Yellowstone. Particularly in the Canyon area, visitors may hear deep rumblings beneath the ground, the stirring of ancient beasts of our imagination and of legend and lore. Perhaps the most famous site of Cave Dragon activity in Yellowstone is Dragon’s Mouth Spring, a thermal activity area hidden in a cave system. This cave is…