Hello! Let me show you my first Minecraft creation - my labyrinth. 
This is my very first serious project.
You can see it in the /j guest world. Just search for the big wooden tower. 

This is the entrance:
http://img146.imageshack.us/img146/9286/48440576.jpg

http://img814.imageshack.us/img814/5151/82353238.jpg

A view from the windows:
http://img94.imageshack.us/img94/2075/30603062.jpg

Top of the tower and labyrinth entrance:
http://img52.imageshack.us/img52/9681/46088627.jpg

http://img600.imageshack.us/img600/9639/13080979.jpg
http://img171.imageshack.us/img171/4625/82072418.jpg
http://img3.imageshack.us/img3/1566/155cc.jpg

Labyrint exit - you will recognize it by the gray-green house.
Feel free to try my labyrinth, but please, don't destroy it. Oh, and watch out for the traps...