South Entrance, 1974, by Harlan Kredit. The South Entrance was first established in the 1890s, but it took many years for a decent road to be built and for tourists to use this approach to the Park. #OldYellowstone

Grand Geyser, 1923. It was named in 1871 during the Hayden Geological Survey, and is the tallest predictable geyser in the world, erupting every 7-15 hours at heights up to 200 feet. #oldyellowstone

Morning Glory Pool, 1928 and 2015 - the color change caused by irresponsible visitors. Learn more in our history: yellowstoneinsider.com/2015/09/07/old… #OldYellowstone

Ranger Frank Sissby and Julie Pressen of Chicago, Illinois, at Artist Point, Union Pacific Museum Collection. #OldYellowstone

Madison Junction Museum, 1939 & 1940. Built in 1929-30 as a “trailside Museum,” allowing visitors traveling by car to learn about the Park. It now houses an information station & ynpforever store, & is listed on the National Register of Historic Places. yellowstoneinsider.com/2015/06/30/mad…

Golden Gate Canyon and Viaduct, 1917 in Northern Pacific Railway’s Land of Geysers. This version of the Viaduct was built in 1900 - but the location has a long and interesting history. Read more here: yellowstoneinsider.com/2016/05/09/old… #OldYellowstone

Someone with the National Park Service has a sense of humor. Here's the view from the second Mount Washburn fire lookout webcam, with views of Yellowstone Lake, the Grand Canyon of the Yellowstone and Hayden Valley. More on Yellowstone webcams here: yellowstoneinsider.com/yellowstone-na…

“Boat ready for trip to Mammoth,” October 1936. #oldyellowstone instagram.com/p/CF4fGkepXb1/…

The sun is out, and it's the last week of the 2020 Yellowstone summer season. Apart from Mammoth, services in Yellowstone National Park are closed, but there are still folks heading in for one last visit while the going is good. What's open and closed: yellowstoneinsider.com/2013-yellowsto…

Canyon Village, 1973. Aerial photo by Stanley Canter. #oldyellowstone

Lamar Buffalo Ranch, November 1929. The ranch was built in 1915 as part of a strategy to feed and breed bison, after their numbers in the Park were counted at only 25 in 1901. The site was added to the National Register of Historic Places in 1982. #oldyellowstone

Trail location at Swan Lake Flats, November 29, 1936. Located a few miles south of Mammoth Hot Springs, this is a popular spot to watch wildlife. #oldyellowstone

Lone Star Geyser, 1920s. Read about the evolution of its name here: yellowstoneinsider.com/2017/08/28/old… #oldyellowstone @ Lone Star Geyser instagram.com/p/CIfydNJrYvI/…

Inspecting cracks in Bath Tub Pool at Terrace Spring after the Hebgen Lake earthquake on August 17, 1959. The earthquake affected many thermal features in the Park. yellowstoneinsider.com/2017/08/17/old… #OldYellowstone

Steaming springs at Mammoth Terraces, January 1937. Photograph by William E. Kearns, who was an Assistant Park Naturalist. #OldYellowstone

Mule deer at Mammoth, January 27, 1957. #oldyellowstone @ Mammoth Hot Springs instagram.com/p/CKnKHtWriNW/…

Spring thaw at Roosevelt Arch, March 28, 1943. #OldYellowstone

Your gentle reminder of this fine, fine resource.