Kelsey D. Atherton for Popular Science:  Flying machines are hard secrets to keep. By their very nature, they soar into the heavens, above the heads of those below. America's military tends to keep its secret planes secret by only flying them in vast swathes of empty desert, until they’re ready for public debut.

But that’s not really an option for Amazon, which is testing delivery drones in the United Kingdom (while it attempts to weave its way through U.S. regulations). So where, exactly, are Amazon drones flying?

A field eight miles south of Cambridge named “Worsted Lodge.” No, really.

In a thorough photo-essay at Business Insider, reporter Sam Shead pinpoints and explores the site and the field, until turned away by a security guard.  Cont'd...