Matey, #1 is the Sierras, or more precisely the highest point of Sierras or the highest piont in the lower 48.
Number 2 is Death Valley but it's the east side looking west towards the salt flats with the Panamints in the background.
Number 3 is the East side but a little further south I've actually never been to Scotty's Castle, I avoid the tourist spots. B-)
Number 4, Mono lake, bingo
Number 5, bingo, correct, Southern Arizona desert, the only place where Saguaro's grow naturally.