Tustin, California

Hangar No. 2 (Building 29) at the former Marine Corps Air Station
in Tustin, CA measures 1,072 feet (327 m) long by 292 feet (89 m)
wide by 192 feet (59 m) tall. It and its "sister" structure
(partially-visible to the right) are listed on the
National Register of Historic Places and designated
National Historic Civil Engineering Landmarks.
The hangar is slated for demolition to make way for
a housing development.

Click here for video - 25 minutes

Links:
http://en.wikipedia.org/wiki/Marine_Corps_Air_Station_Tustin
http://www.militarymuseum.org/MCASTustin.html