A pair of tourists decided they wanted a closer look at Yellowstone National Park's biggest and most famous hot spring, wandering off the boardwalk and ignoring warning signs to stand right on the colorful bacterial mats at Grand Prismatic.
A video of the incident (which you can see below) was shared via infamous Instagram account TouronsOfYellowstone this week. It shows the pair standing right at the water's edge, despite warnings from the National Park Service (NPS) that the ground around springs can be very thin, with scalding hot groundwater just below the surface. People have been seriously injured after accidentally slipping in.
