Rock Cairns (U.S. National Park Service)

See a Rock Cairn? Push It Over, Yosemite National Park Says

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

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

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

Resist the urge to build or topple rock cairns - Upworthy

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

When is it OK to stack rocks on the trail? - Adirondack Explorer

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

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

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

Rock cairns discouraged in parks

Balancing Act: The History of Rock Cairns and Why Stacking Rocks is Discouraged in Zion