This is something I started when i was bored but it gradually got better and better. Basically, the concept of it is that its a huge mining company complex with loads of different sections and rooms and building separated by minecart tracks. To give you an idea of how big its going to be, notice that in the screen shots I've done quite a lot, and then notice that its only 5%, so you'll probably appreciate that there is much work to be done on my part. However, don't start thinking that it'll never be finished, because it will be finished sometime within the next year or so. I'll go on it and develop it in every moment of spare time I have. If you can't wait that long, here's the seed:
5867183928756652377
The coordinates are as follows (roughly but you'll see it when you get there):
X:369
Y:82
Z:19
So far I have built the Owner of the Mining Complex's (That's you) house, the station that's going to have mine tracks leading to different places and the mine track leading to the main mine shaft (Which I haven't started yet).
When I next update this project you can probably expect me to have finished the house, finished the station, started the mine shaft and started a few places that the mine tracks go to, eg. the board of directors etc.
By the way, when you download the world file, I know it says Awesome castle,well thats because I was going to make it a castle but then I changed my mind. So when you see awesome castle, thats the right file.