The chosen location was a salt mine in Austria, which the Nazis tried to bomb later when they realised they were losing the war. How did the art survive? Video by Martina Žoldoš Produced by ...

"I'm not sure that people connect the large piles of salt to the massive mining operation happening 2,000 feet below the lake." Workers can enter the mine by taking a four-minute elevator ride.

This article was originally published with the title “ Ancient Salt Mines of the Indians ” in Scientific American Magazine Vol. 135 No. 2 (August 1926), p. 116 doi:10.1038 ...