Welcome to Stronghold on Sugarloaf Mountain Stronghold, Incorporated is a non-profit corporation, organized in 1946 by the late Gordon Strong. It owns and operates the mountain property for the public’s “enjoyment and education in an appreciation of natural beauty.” Sugarloaf Mountain has been designated a Registered Natural Landmark because of its geological interest and striking beauty. Stronghold agreed to maintain its natural state, and your help in this regard will be a most welcome contribution. Funds for maintenance and improvement do not come from federal, state, or municipal sources.