Rock Cairns (U.S. National Park Service)
Por um escritor misterioso
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Should be left where they are': National parks refute Yosemite's PSA to knock over cairns
Why you shouldn't stack rocks in the wild - The Washington Post
Zion National Park - Rock stacking in national parks may seem harmless, or even fun to make, but we invite you to reconsider the problem they pose from a broader perspective. On
Please don't stack rocks on your next hike. Here's why. - Lonely Planet
STOP BUILDING CAIRNS Ecology for the Masses
Stop the rock-stacking — High Country News – Know the West
What's with all those stacks of stones in the woods?
Rangers, walking groups, urge public to stop making rock towers on hiking trails - ABC News
Stacking rocks leaves nature in the balance
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por adulto (o preço varia de acordo com o tamanho do grupo)
