4,340-foot Allen Mountain is one of the more rued hikes for aspiring 46ers. It sits to the south of most of the other High Peaks, isolated from all the other trailheads. The start of the hike, shared with the über-cool Mount Adams and its restored fire tower, is a whopping 9 miles (one way!) from the summit.
Many (most?) people choose to climb Cliff & Redfield Mountains from the south via the Upper Works trailhead. From the Adirondack Loj, where Kathy and I started, the mileage is about the same, but our route skirts the 3,800-foot elevation Lake Arnold, adding several hundred feet of climbing both ways.