The summit of Adams Mountain is the top of what was once an old ski area that operated from 1972 to 1982. The route to the top is via a snowmobile trail.
About the ski area:
https://www.newenglandskihistory.com/Maine/evergreenvalley.php
https://hashtagmaine.bangordailynews.com/2017/03/07/around-town/abandoned-maine-ski-lodge-is-eerily-quaint/
Cement footing of the old ski lift. August, 2011 
Looking Southeast toward Kazar Lake and Pleasant Mountain. February, 2015 
Pleasant Mountain and Kazar Lake from Adams Mountain. October, 2019 
Looking Southeast toward Kazar Lake and Pleasant Mountain. August, 2011 
Looking Southwest past the pitch pine trees that are found in abundance at the summit, with Kearsarge North dominating the background 
Looking South toward Pleasant Mountain in the center. August, 2011 
Pleasant Mountain, Kearsarge North, and Doublehead from Pleasant Mountain. October, 2019
Western Maine Views 