This is our most sought-after photo, and one which encompasses humanity's greatest achievement.  An authentically-signed, 8x10 color Kodak print of Buzz Aldrin on the Moon.  Signed with a blue Sharpie, "First Lunar Landing, Buzz Aldrin, Apollo XI".  A lot of handwriting and not just a mere signature.  This is probably the most iconic photo ever taken during the Apollo moonlandings.