One of the best trails in Acadia National Park in Maine is the Precipice Trail. The trailhead is near the start of the Park Loop Road just before Sand Beach.
Please note that the trail is closed for several months in the spring and early summer for peregrine falcon nesting. Although not the Knife Edge on Mount Katahdin or Angels Landing in Zion National Park the trail is still not for the faint of heart.
The trail is less than one mile in length but it is almost straight up a 1500 foot cliff. There are iron rungs and ladders attached to the cliff face to aid ascent.
When you reach the top and to be honest all the way up as well there are spectacular views.
A word of warning it is lot scarier going down than coming up so be prepared to take a much longer trail down a gradual incline for your descent.