Yellowstone National Park
circa 1970

Lower Falls, the biggest waterfall in Yellowstone, is the most famous in the Park, hands down. In fact, the 308-foot tall waterfall it is most likely the second most photographed spot in Yellowstone, with Old Faithful Geyser being the first. There are numerous views of the Falls from both the east (Inspiration Point, Grandview Point and Lookout Point) and west (Artists Point) sides of the Grand Canyon, most of which require only a short walk or virtually no walk to see. The trail to the top of the Falls (3/4 of a mile roundtrip, but steep with many switchbacks) is a must, as the experience of standing atop the Falls is one of the most breath-taking experiences in the entire Park.
The canyon’s colors were created by hot water acting on volcanic rock. It was not these colors, but the river’s yellow banks at its distant confluence with the Missouri River, that occasioned the Minnetaree Indian name which French trappers translated as roche jaune, yellow stone. The canyon has been rapidly downcut more than once, perhaps by great glacial outburst floods. Little deepening takes place today.

https://yellowstone.net/waterfalls/lower-falls/

https://www.yellowstonepark.com/things-to-do/natural-wonders/3-waterfalls-of-the-grand-canyon-of-yellowstone/

Yellowstone National Park is an American national park located in the western United States, largely in the northwest corner of Wyoming and extending into Montana and Idaho. It was established by the 42nd U.S. Congress with the Yellowstone National Park Protection Act and signed into law by President Ulysses S. Grant on March 1, 1872. Yellowstone was the first national park in the U.S. and is also widely held to be the first national park in the world. The park is known for its wildlife and its many geothermal features, especially the Old Faithful geyser, one of its most popular. While it represents many types of biomes, the subalpine forest is the most abundant. It is part of the South Central Rockies forests ecoregion.

Yellowstone National Park is a nearly 3,500-sq.-mile wilderness recreation area atop a volcanic hot spot. Mostly in Wyoming, the park spreads into parts of Montana and Idaho too. Yellowstone features dramatic canyons, alpine rivers, lush forests, hot springs and gushing geysers, including its most famous, Old Faithful. It's also home to hundreds of animal species, including bears, wolves, bison, elk and antelope.


https://en.wikipedia.org/wiki/Yellowstone_National_Park

https://www.nps.gov/yell/index.htm