Spanning swaths of Montana, Wyoming and Idaho, Yellowstone National Park is home to one of the most famous images to come out of the 63 national parks across the country. The bright blue, green and orange colors of the geothermal geyser Old Faithful are caused by thermophiles or microscopic organisms that thrive in hot temperatures in spring water rising from deep within the ground.

The 60-year-old was walking with her husband and dog near a geyser when she broke through the ground into scalding waters on Monday afternoon, according to the National Park Service.

Yellowstone National Park has more potential hazards than the thermal pools. Bear and bison have also injured or killed visitors.