It's pretty obvious when you hike the Methuselah trail [1]. It's not an imposing tree but it stands out once you know what you're looking for so it's not a very well kept secret.
[1] https://www.fs.usda.gov/recarea/inyo/recarea/?recid=21134
[1] https://www.fs.usda.gov/recarea/inyo/recarea/?recid=21134
Currently, the road to the grove is closed for the season. Weather also keeps people away.
[1]: at the scale of the western US.