Rock Cairns (U.S. National Park Service)

Rock cairns should not be messed with on trails: National Park Service

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

Rock Cairns (U.S. National Park Service)

Rock cairns discouraged by Yosemite National Park officials - NZ Herald

Rock Cairns (U.S. National Park Service)

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

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

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

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

Texas park officials give stance on to leave or knock down rock cairns

Rangers, walking groups, urge public to stop making rock towers on hiking trails - ABC News

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