When Elvis Presley first moved into Graceland in 1957, he immediately installed a privacy wall on the upstairs landing with one-way mirrors for security.

The mansion had an open house policy for his Memphis Mafia; however, the inner circle would have to be personally invited upstairs to his safe haven.

Up there in the mysterious space are the likes of his bedroom, office and the bathroom where he died on August 16, 1977.

To this day, Graceland archivist Angie Marchese meticulously preserves the…