This GQ story about the North Pond Hermit is amazing.
One day in 1986, Christopher Knight left family and friends behind for good, and spent 30 years leaving alone in the woods of Maine, sleeping in a hidden tent. He survived by stealing supplies and books from the nearby cabins and towns, and with the exception of encountering a solitary hiker, had no interactions with other humans during that time.
He was apprehended during a theft in 2013, and this article covers all the interviews that followed. Incredible.