There was a time in Boston history when blackouts had nothing to do with power outages. This March 31, 1942 photo was taken with the lights of Boston aglow, right before an air raid test that night plunged the skyline into darkness. The purpose was to make it difficult for any bombers to find targets.&nbsp; (AP Photo/J. Walter Green)

Catching Boston’s night sky in 1942 – right before an air raid test cut the lights.{ai:summary}<p>Boston, 1942, air raid test plunges city into darkness as precaution against bombers. Historical blackout photo reveals wartime measures. #history</p>

Throwback Thursday

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