According to The Ghosts of Famous Musicians by Ashley Watson of Notebook of Ghosts, the ghost of Elvis is said to haunt various locations, including:
Old RCA Recording Studios (Tennessee). People have reported weird noises coming out of sound equipment, lights blowing out, objects being moved, and the apparition of The King himself.
Room 1016 of the Knickerbocker Hotel (Hollywood). Elvis stayed here when he filmed movies. Visitors and staff attribute the eerily cold temperature of the room to his spirit.
Graceland (Memphis). There’s a couple photos circulating online that supposedly capture Elvis looking out the window.
Las Vegas Hilton. People have seen his spirit in the penthouse, the basement where he hung out with his band, and the elevator he used to avoid screaming fans.
The Ryman Auditorium (Nashville). Lisa Marie Presley claims she heard her father, Elvis, while there. After a performance at the theatre she went to her dressing room, but the door was stuck and she could not get it open. Suddenly, she heard the distinct laugh of her father and the door opened.
The Devil's Muse 