At the turn of the twentieth century, several well-regarded insider books on fraternal orders claimed that as many as one-third the population of the country belonged to among six hundred different secret orders. Now that's a mother lode of secrecy.
On October 13, 1792, stone masons laid the cornerstone for the White House. The men placing it were brothers in one of the world's most secretive organizations -- the Freemasons. Within twenty-four hours, the stone supposedly went missing.