The world's largest collection of cairns may well be here.
The cairns seem to be newly created. Older photographs simply show an empty dirt ground.
The cairns from another angle (Click on the image to enlarge it.)
A sample of the gravity-defying cairns
Location: Kings Canyon Overlook, Generals Hwy (Hwy 198), Sequoia Nat Pk, California, USA
near Buena Vista Peak Trailhead
N 36° 43.165 W 118° 53.824
Date: 2018 May