Ancient Yellowstone episode 2 - Frozen Archeology

Ancient Yellowstone episode 2 - Frozen Archeology: There are places in Greater Yellowstone where the snow never melts, or at least, it never used to.
Last Nature posts on HDclump.com and ClumpHD.com:
https://hdclump.com/winterwatch-2021-episode-3/
https://hdclump.com/winterwatch-2021-episode-2/
https://hdclump.com/winterwatch-2021-episode-1/
https://hdclump.com/a-perfect-planet-episode-4-oceans/
https://hdclump.com/a-perfect-planet-episode-3-weather/
https://hdclump.com/a-perfect-planet-episode-2-the-sun/
https://hdclump.com/a-perfect-planet-episode-1-volcano/
https://hdclump.com/the-end-of-the-line/