Think those stacks of rocks are unique and fun? Think again.
Please don't stack rocks on your next hike. Here's why. - Lonely Planet
Stacking Rocks Leaves Nature in the Balance - Red-tail Land Conservancy
Storm King Mountain Hike the Hudson Valley
Please don't stack rocks on your next hike. Here's why. - Lonely Planet
Balancing rock - Wikipedia
Mt. Tammany Hike the Hudson Valley
Why Do Hikers Stack Rocks?
Taylor 101.5 WPDH ? Page 6
Don't Move Rocks! Friends of the Smokies
Popolopen Torne Hike the Hudson Valley
Please don't stack rocks on your next hike. Here's why. - Lonely Planet
Understanding Trail Markers