Two tourists have ignited fury after being seen walking perilously close to the boiling waters of a world-famous hot spring. Footage shot by Tanya Saueressig, of Livingston, Montana, showed the moment inside Yellowstone National Park when two women began approaching the Grand Prismatic Spring around 7pm local time Sunday after veering off-track. The women nonchalantly walked on the spring's colorful microbial mats, which shine hues of yellow, orange and red thanks to the heat-loving bacteria around the edges of the pool. Saueressig said she stopped in her tracks when she spotted the women near the 160-foot-deep spring, which has a...