What's the best thing you've ever built on minecraft?

[MisterGameOver]

I built a castle with village only.
In this map, I make a donjon in the cave with lot adventures.

This is the only picture because my map was deleted.
http://www.noelshack.com/2012-46-1352925470-minecraft.jpg

And I make others castle always only:

 

[oath2order]

That castle looks precariously balanced off a cliff