When fans visit the Graceland mansion today you may not be able to go upstairs, but you can see up the main staircase.

If you look closely from the bottom of the stairs, you can see there’s a security wall on the first-floor landing with one-way mirrors so the King could see who was around.

Similarly, Elvis Presley kept CCTV cameras by his bedroom to have an idea of who was in the house when he went downstairs.

On the landing viewable from the ground floor, fans can also spot some mysterious…