Even though the Nevada Proving Grounds were about 270 miles from Los Angeles, the eerie glow of the atomic tests could still be seen from the City of Angels.
Top image: A disturbingly cheery postcard-like photograph courtesy Los Angeles Public Library.
These pictures were taken between 1951 to 1955.
No photographer name has been credited with the above photo, but the library description reads, "An A-bomb blast set off in Nevada at 4:36 a.m., on April 18th, 1953, was judged by early risers to have been the most sensational of any seen so far. The blast made the eastern horizon as 'bright as day.'"