Nine of 10 cairns atop Wright Peak were deliberately knocked down on Monday. The Adirondack Daily Enterprise reports cairns are rock structures that are used for navigational purposes above the treeline, where trail marker discs aren’t feasible. They are one of two primary navigational sources in the Adirondacks’ alpine zones, along with yellow blazes that are painted on to rockface to mark the trails. Work is already underway to fix them.