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

The 60-year-old woman, who has not been named, was near the Old Faithful Geyser at the Wyoming national park this week when she stepped through a thin crust over scalding water, park officials said.

A 60-year-old woman suffered second- and third-degree burns to her lower leg this week while walking off-trail in Yellowstone National Park, officials said.