You might be familiar with the "Minecraft" phenomena - a game where you build structures with everything from basic blocks to complex logic circuits. We have been running a Minecraft server which has become one of the more popular ones with huge worlds of structures.
Here is an album of screen shots from our worlds: http://greenviewdata.imgur.com/
And a couple of YouTube videos created by our users:
Our Minecraft server became popular after our Minecraft office prank video hit Youtube: (Over 100,000 views so far)
If you are a Minecraft gamer, I hope you will join our server at: mc.greenviewdata.com
(If not already a Minecraft gamer, you need to purchase a license at www.minecraft.net and download the software. You can then run the software with any Minecraft server.)