A columnar basalt formation with hexagonal columns formed from cooling lava. I really like this geology but I struggle finding the right light and composition to show it off properly....

Wikipedia: The Sheepeater Cliffs are a series of exposed cliffs made up of columnar basalt in Yellowstone National Park in the United States. The lava was deposited about 500,000 years ago during one of the periodic basaltic floods in Yellowstone Caldera, and later exposed by the Gardner River. The cliffs are noted as a textbook example of a basaltic flow with well defined joints and hexagonal columns. They were named after a sub-band of Western Shoshone known as Tukuaduka (sheep eaters) because they hunted bighorn sheep.