Earlier this week, Rangers from Yosemite National Park shared a Facebook post warning hikers not to build rock cairns, and advising them to dismantle any they happen to find on their adventures. The post was accompanied by a video showing a Ranger kicking over a particularly tall stack of rocks that had been assembled by visitors.
"When used appropriately, rock cairns are great for navigation, safety, and delineating a new or hard-to-follow trail," they wrote. "In general, rock cairns should only be constructed by rangers and trail workers. Please dismantle and refrain from building rock cairns when you visit Yosemite."
