Brian Moore
Moderator
This is one of two blimp hangars located in Tustin, California at what was once the Marine Corp Air Station. They were built in 1942 to house blimps that would be used to patrol the coast.
Although the hangars look all concrete they are constructed of wood and are said to be the world's largest "clear span" wood buildings.
In the base's later years big, double-rotor helicopters occupied the hangars. I used to work nearby and it was a wonderful site to observe the big Sikorsky's or whatever they were lumber up and down and dominate the Tustin sky.
I took this photo with a Canon SBIV and 50mm Summar lens. The film was Kodak Tri-x 400.
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