Why Do People Stack Rocks Along Colorado Trails?

Why do people stack rocks along Western Colorado trails? Here's what Colorado residents say via social media.

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

These Impacts Are Stacking Up! - Leave No Trace

Rock Stacking –

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458 Man Made Cairns Images, Stock Photos, 3D objects, & Vectors

Why You Shouldn't Stack Rocks On Hikes And What To Do If You See Them

Why You Shouldn't Stack Rocks While Hiking - ASO Mammoth

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

Should You Knock Over Cairns or Leave Them? Even the National Park Service Can't Agree. - Backpacker

The Interesting Meaning of Stacked Rocks on Trails

Why Stacking Rocks is Horrible for Hudson Valley Trails and Parks

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

Rock Cairns (U.S. National Park Service)