Rock Cairns (U.S. National Park Service)

The secret life of rock cairns - Wilderness Magazine

I Didn't Know That!: Rock Cairns (U.S. National Park Service)

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

Don't Move Rocks! Friends of the Smokies

Message in the rocks: Acadia's Bates cairns get new focus

Hiking in the Desert: 11 Things to Know Before You Go - We're in the Rockies

Resist the urge to build or topple rock cairns - Upworthy

Making Mountains Out Of Trail Markers? Cairns Spark Debate In Southwest : NPR

The cairns of Acadia: Objects of wonder, subjects of vandals

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

Leave No Trace Means Don't Build The Cairn - Why You Shouldn't Build Rock Cairns in Parks — Know The Place Magazine

Yosemite says rock cairns are bad — and you should knock them down - Los Angeles Times

Yosemite says rock cairns are bad — and you should knock them down - Los Angeles Times

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