On March 1st, Yellowstone, the world’s first national park, was created 150 years ago. I had the pleasure to visit the park with its beautiful mountains, over 10,000 hydrothermal features, and abundant wildlife, together with my wife Joan in 2005, 2007, and 2018. In 2005 I still used mainly a Nikon N2020 35mm film camera but played a little with a 3.2 Megapixel, Minolta Dimage Xt digital camera. At the second visit I just had started with serious digital photography and little did I know how to create an image with some impact. But it is nice to have these old images as a memory. It was interesting to see in 2018 how the National Park had changed and how the park administration tried to deal with the vast number of visitors that pour in the park every day, even in the off-season. It still remains a magnificent place to visit and to photograph. Yellowstone National Park has inspired conservation efforts around the globe since its inception in 1872 and in order to celebrate this event I pulled a few pictures from the library and like to share them with you.