These acrobats did some amazing feats up on the Empire State Building in August 21, 1934:

Several dates have been linked to this performance, however, the photograph from the Corbis archives is dated with the year '34.

Featured image: "Acrobats Jarley Smith (top), Jewell Waddek (left), and Jimmy Kerrigan (right) perform a delicate balancing act on a ledge of the Empire State Building in Manhattan." Copyright Bettmann/CORBIS.

Via @GeedonBruce.