Atomic bomb blasts seen from downtown Las Vegas, 1951.
Five bombs were exploded at Nevada Test Site, Jan 27-Feb 6, 1951. These were the first of 100 above-ground nuclear tests conducted in Nevada until they were banned in 1963. Nuclear detonations continued underground until 1992.
P.S. Happy Holidays.
(Source: http://vintagelasvegas.tumblr.com/)