It was suggested that I construct the Forbidden City. I did some research to find out how big it is, collect some maps and photos, etc.
It is 750m wide and 960m long.
The moat is 52m wide and 6m deep.
The walls are 10m high, 8.6m thick at the base and 6.7m thick at the top.
It has OVER NINE THOUSAND rooms.
This is going to take a long time, and will require a lot of red wool.
edit:
Here's a couple of sections of map showing the kind of scale we'd be talking about, assuming 1px = 1m:
http://caerphoto.com/misc/forbidden-city-size.png
http://caerphoto.com/misc/forbidden-city-size.jpg
I suppose we can be grateful none of its buildings are particularly tall :&
EDITED: 5 Aug 2011 11:03 by CAER