Thermal pools are relatively rare. But this is only part of their attraction. A trip to Yellowstone National Park puts you in hot pool overload. You can walk by a dozen of them in a matter of a few minutes. It is sort of like being in an art museum. One or two catch your eye but the rest fade into the numbers in the background. It is only when you take a photo and later look at each photo that you can begin to appreciate what you saw at the time. This particular pool probably has a name but did not merit a sign.