Calico Ghost Town
"Four miles West of Yermo, Nine miles East of Barstow, California"
According to the back of the postcard, Calico was the largest silver producer in Southern California, mining more than $86 million. (The website downgrades that to $20 million.)
The town flourished from 1881 to 1896 and hosted 500 silver mines. When the price of silver plummeted, the town was abandoned. Walter Knott, of Knott’s Berry Farm, bought it in the 1950s and restored the buildings. No it’s part of the San Bernardino County Parks.
I can’t date this unsued postcard either, but judging from the weird colors, I’m going to guess 1970s.