The "X" is where Elvis was located when he recorded "That's Alright" in Sun Studios. Interesting tour. Didn't realize it was the secretary who recorded him originally on his first demo. Didn't know Sun sold him to RCA for $35,000 which apparently gave Sun money to record and distribute other artists like Carl Perkins, Jerry Lee Lewis, Johnny Cash, Charlie Rich, etc. Also, didn't know that they were closed for 25 years or so. And, that U2 recorded some of their Rattle and Hum album there.
Doesn't look I am going to make it to Graceland this trip. I have read that they recommend at least 4 hours of time, and I don't have the patience for that right now. Probably not making it to Walnut Ridge, AR to see the Beatles sites either.