Please post here the most beautiful, innovative, inspirational, yaw-dropping id Tech 3 map you've seen.
I'm not going to shoot all my bullets right away, so I'll just start with presenting you to the body of work of Simon "Sock" O'Callaghan. There are even more maps in the right sidebar list
Not only his works fulfill all the requirements I listed, they also can be characterized by the greatest attention to detail I've ever witnessed in any q3 map. What amounts of work and passion he puts into his creations can be read on the blog linked above. If you are a mapper don't forget to read his tutorials too.
If you viewed screenshots and feel ready to get your hands dirty, I can only recommend you getting Quake III Arena, ioqake3 and playing through The Edge of Forever - a very enjoyable single player (or coop I believe!) puzzle/maze level. Watch teaser on YouTube if still not convinced.