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.
Location: Kings Canyon Overlook, Generals Highway (Hwy 198), Sequoia Nat Pk, California, USA
near Buena Vista Peak Trailhead
N 36° 43.165 W 118° 53.824
Date: 2018 May
The cairns from another angle (Click on the image to enlarge it.)
A sample of the gravity-defying cairns