Hangar One is one of the world's largest freestanding structures, covering 8 acres (32,000 m2; 3.2 ha) at Moffett Field near Mountain View, California in the San Francisco Bay Area.

During the brief period that Macon was based at Moffett, Hangar One accommodated not only the giant airship but several smaller non-rigid lighter-than-air craft simultaneously.

At the time the Goodyear Airdock was built, the structure, located in Northeast Ohio, was the largest building in the world without interior supports.

They were designed and built in 1921–1922 by French structural and civil engineer Eugène Freyssinet, the major pioneer of prestressed concrete, and destroyed in World War II.

[8][9] Plans to convert it to a space and science center were put on hold with the discovery in 2003 that the structure was leaking toxic chemicals into the sediment in wetlands bordering San Francisco Bay.

The chemicals originated in the lead paint and toxic materials, including polychlorinated biphenyls (PCBs), used to coat the hangar.

[11] In December 2010, the Navy began remediating the PCBs, lead and asbestos, and NASA was evaluating options for reuse of the hangar.

In April 2011, after months of planning and preparation, work to remove the exterior panels began, requiring "the biggest scaffolding job in the history of the West Coast."