Brian Sodaro submitted this 16 mile, 5-summit loop in the Adirondacks:

From Hikers Parking on RT 73, Follow the road to the Ausable Club. From the Ausable Club, head along the Lake Road to the Gil Brook Trail (not the cutoff). Ascent Colvin, then Blake, then re-ascend Colvin, drop down to Elkhead Pass and ascend Nippletop. From there, take the Leach trail over Dial, Bear Den and Noonmark Shoulder, finally completing the loop by retracing your path down the Lake Road, and out to the Hikers Parking lot off Rt 73.

The long-distance (35 mile) Bucktail Path is an isolated and demanding trail, maintained by Elk State Forest with occasional visits by the KTA trail care team. Do not expect to see anyone else when you hike. The trail is a rewarding experience for seasoned hikers seeking a challenge, because it offers extra loneliness and solitude, even for wild Pennsylvania.

A 75km trail from Voss to Vik, The route is marked by The Norwegian Trekking Association. 

The Mattabesett Trail in southern Connecticut is part of the state's blue-blazed trail system. Depending on what source you use, the end-to-end distance is between 57-62.5 miles.

The Kissing Bridge Trailway travels for 45 km through rural communities and rivers and wetlands of southern Ontario along the right-of-way of a former railway. You can take a 2km detour to see the West Montrose Kissing Bridge, which is the last covered bridge in Ontario. The trail surface is stone chip for much of the trailway. Because the trailway runs along former rail lands, it's largely flat and even.