Okay, so it's only one secret. Hat tip to Jeff Meyerson.
Elvis made secret visit to Britain | NEWS.com.au: "ROCK'n'Roll legend Elvis Presley did in fact visit Britain, it was revealed yesterday, with a secret visit to London accompanied by another rocker.
For more than half a century it was generally accepted the 'King' only made a fleeting transit visit to Scotland in 1960 - much to the disappointment of his legion of UK fans.
But theatre producer Bill Kenwright has revealed in a radio interview that Presley, then 23, managed to go sightseeing in London with Cockney singer Tommy Steele."