Rock Cairns (U.S. National Park Service)

Cairns and a Century of Navigation - Mt Washington Valley Vibe

Scientists Say: Hey, Hikers, Stop Stacking Rocks!

Rock stacking in national parks: Why is it bad?

Please don't stack rocks on your next hike. Here's why. - Lonely Planet

National Park Rangers Are Encouraging You to Knock Over Rock Cairns - SnowBrains

Rock balancing - Wikipedia

The secret life of rock cairns - Wilderness Magazine

Should you push over these stacks of rocks? Here's what NPS says you should do

Please don't stack rocks on your next hike. Here's why. - Lonely Planet

Stop the rock-stacking — High Country News – Know the West

What The National Park Service Advises About This Common (And Controversial) Practice

What Are Cairns and Why Shouldn't You Make One? - CampEasy Iceland