I was often struck by the forethought of President Teddy Roosevelt and grateful for his actions in making this our first National Park. I was also grateful for all of the men and women who worked in the past to save it--like when the Army National Guard lived on the park to protect the herd animals from poaching, or the work of naturalists and ecologists to bring back the gray wolves, or the heroic efforts of all of those involved in fighting the big fires twenty years ago. You can help but feel small when surrounded by all of that wonderful wildness. I mean feel small in a good way.
Let's just say that if Nature is your religion, there's not many better places to worship than Yellowstone Park.