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.

What's the Deal With These Piles of Stacked Rocks in Maine?

Why you shouldn't stack rocks in the wild - The Washington Post

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

1,111 Man Made Rock Stack Images, Stock Photos, 3D objects, & Vectors

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

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

Rock Stacking –

Why you shouldn't stack rocks in the wild - The Washington Post

Stacked Rocks Meaning: What Stacked Stones On A Trail Mean

Rock Cairns (U.S. National Park Service)