While I am usually incapable of picking favorites, I must admit I do have a favorite national park – Yellowstone. I have visited more than twenty times and I never tire of the natural wonders contained in its over 2 million acres. It was the first national park established in the United States, on March 1, 1872 – so today I will belatedly mark its 150th birthday with a historic journey through the park via images in our collections. William Henry Jackson is credited as the first person to photograph Yellowstone, as part of the Hayden Geological Survey of 1871. Jackson took this photo entitled “Great Falls of the Yellowstone” while traveling with the survey. These falls are now known…