This is one of the best open-air walk through parks in the United States. The fact that on July 25, 1805, Lewis and Clark arrived here at the headwaters of the Missouri permeates your senses of adventure while standing here. And what a sight it is.....three rivers coming together to form the "Mighty Missouri" River. Lewis and Clark were of course surprised that they had reached the end, or beginning as it were, of the Missouri River. And an even bigger surprise was the emerging of the Rocky Mountains to their front as they stood here on this spot in Three Forks, Montana. My favorite spot in this park is standing on top of "Fort Rock" and looking at the panorama of the Gallatin River winding through beautiful grasslands with mountains in the background all around. A mile upstream from where the Gallatin flows into the Missouri is the point where the Jefferson and Madison Rivers meet and form the Missouri. It is to me a nearly religious moment to stand here at this point (you can actually stand right on the water) and see the two rivers bumping into each other with the roiling waters then headed downstream. I was so moved by this sight that I went back early in the morning to see the rivers in early sunlight and it was wonderful.