See Description for updated links. Various structures and saves gathered from Minecraftians and placed on one map. Added a Treasure/Scavenger hunt that takes you across the various parts of the map. Makes a good SMP map also.
I was blown away buy a lot of the individual structures out there and had a folder full of downloads. I decided to try combining some of those onto one map. This was the result. I could of kept going for ever, but the map was getting a little big. Here is the forum info and most updated links, Minecraftforum.net