Have you ever noticed piles of rocks stacked up when you’ve been hiking or spending some time out in nature? Well, if you haven’t, we’re here to tell you that it’s going on out there and folks are ...

(NEXSTAR) — You may have been on a hike in, say, one of America’s national parks and seen bountiful nature — tall sequoias, dazzling waterfalls, a breathtaking valley of flowers. And then you come ...