Rock Cairns (U.S. National Park Service)

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

Speaking of Idaho - Rick Just

Stacking rocks leaves nature in the balance

Rock cairns discouraged by Yosemite National Park officials - NZ Herald

What are Rock Cairns & Why You Shouldn't Build Them – Bearfoot Theory

Yosemite asks visitors to stop building, knock over rock cairns – NBC Bay Area

Should you knock over that rock cairn? It depends where you're hiking

What are Rock Cairns & Why You Shouldn't Build Them – Bearfoot Theory

Don't Move Rocks! Friends of the Smokies

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

See a rock cairn? Push it over, Yosemite National Park says - The Manual

Experts warn tourists to avoid 'rock stacking' especially in national parks - Mirror Online

Rock Cairns (U.S. National Park Service)