Loring Air Force Base Double Cantilever Hangar, Military aircraft hangar in Limestone, Maine.

The Loring Air Force Base Double Cantilever Hangar is a large military aircraft hangar in Limestone, Maine, with a width of 250 feet (76 meters) and length of 600 feet (183 meters). The structure features arched steel trusses on both the north and south sides, each with six large doors that create openings about 300 feet (91 meters) wide.

This hangar was built in 1954 to serve as a maintenance facility for large military aircraft during the Cold War era. The structure represents the engineering advances needed to support the operations of strategic bombers at that time.

The structure represents a milestone in military aviation infrastructure, demonstrating the advances in engineering capabilities required to support Strategic Air Command missions.

The hangar is visible from outside and can be viewed from roads surrounding the former air base. Visitors should be aware that as a former military facility, access may be limited to certain areas.

The foundation uses 260 caissons driven 25 feet (7.6 meters) deep into limestone bedrock to support the massive structure above. This underground engineering solution was essential to support the building's enormous scale and weight.