In May of 2014, a man set out, walking down a trail from Springer Mountain in Georgia's Chattahoochee-Oconee National Forest. He kept walking for the next 153 days until he reached the top of Maine's Mount Katahdin. The man, known on the trail as "Green Giant" and in the real world as just "Gary," snapped a couple of pictures before he left on his long walk and then again when he was done. The effects of the hike, seen in his photos above and below, are pretty stark.

Before and after hiking the Appalacian Trail.

He hiked along, of course, the Appalachian Trail, a stretch of hiking paths that runs more than 2,000 miles from end to end. Millions of people hike the AT every year with a few thousand setting off to conquer the entire length in one go. (My two friends Brian and Leon hiked it a few years ago and produced a great documentary of their adventures.)

Forest trail.

Gary's publishing goals are more literary, and he's since finished a book called "Where's the Next Shelter?" about his time on the trail. The book is based the blog he maintained while hiking that's chock full of stories and photographs from his five months of walking. Swing over and check out the rest of his words and images or pick up a copy of the book.

Meanwhile, here's one below Via Reddit to get you in the right frame of mind.

Appalachian Trai