OK, I removed most of my previous msg and added in a bunch of great new info I found, but when I hit "save" I'd taken too long! Grr. So sorry for the double post & for all the unnecessary wordiness before when the following gives actual, on-topic AT info.
After posting the previous I did a bit more searching and found the info you guys really want - at SectionHiker.com:
"I just got back from the hardest hiking I've done in the past year, hiking southbound on the notorious Mahoosuc trail section of the Appalachian Trail, from Grafton Notch in Maine to Gentian Pond in New Hampshire. . ."
"The Mahoosuc Notch is a narrow ravine situated between the vertical cliffs of Fulling Mill Mountain and the Southern Peak of Mahoosuc Mountain. It is one mile long and filled with car sized boulders that you have to scramble up, over, through, and under. It took me 2 hours to hike this one mile and it required every rock climbing trick I know, wearing a full pack no less. The trail weaves in and out of several caves . . ."
And then the next day, "After hiking up from the shelter and rejoining the AT, I met my first challenge of the day, a rocky scramble up a cliff face. It took me about 5 minutes to figure out if it was even possible to scale this obstacle."