If the plans for NASA's return to the moon come to fruition, the space shuttle will be retired by the end of this decade. It seems likely that the shuttle's launch pad - called LC39 ( Launch Complex 39 ) will then fall into disuse.
What shouldn't be overlooked is the LC39 complex was originally built for and used by the Apollo-Saturn rockets which first landed men on the moon. As such it's a hugely historic site and is, I feel, worthy of preservation.
Out of curiosity, I surfed over to the United Nations World Heritage Sites list to see if LC39 was there. I'm astonished to say that it's not! Surely it deserves to be.
At the very least, I'd argue that the development of spaceflight was the greatest achievement of the last century, in which case the only alternative to LC39 for recognition would be the Baikonur cosmodrome in Kazakhstan.
Personal note
I've been to the Kennedy Space Center and taken the tour bus right past Launch Complex 39. There was even a shuttle (Discovery) preparing for launch there at the time. To my intense annoyance, I hadn't loaded the film into my camera properly, so I don't have any photos - doh!