The Kryptos sculpture, created by Jim Sanborn in 1990 for the CIA headquarters in Langley, Virginia, contains four encrypted messages. Nearly thirty years after its creation, only the first three have been decoded. In 2010 and 2014, Sanborn gave clues to the fourth, showing that characters 64 – 74 decode to “BERLIN CLOCK”. Once all four parts have been decoded, they form another riddle. (http://bit.ly/2LpaPI6, https://nyti.ms/2Lrem8E, http://bit.ly/2sLat6W)