and it wouldn't be visible from space either
woo
( MrSanity still playing WoW more than is healthy, Tue 30 Nov 2004, 0:22, archived)

Neither is the real Wall
It's too thin a line.
There's a large number of things that are big and square enough however... the honda factory in Swindon being one of them :)

edit: sod this for a lark, I have to be at work in 6 hours... night all
( Gizmo.mp3 does not exist, Tue 30 Nov 2004, 0:25, archived)

...
www.snopes.com/science/greatwal.htm
( Sunshine Elephant, Tue 30 Nov 2004, 0:27, archived)

I read somewhere
that the largest man-made structure that is visible from space is a garbage heap just outside new york

(insert your own gag here)
(Ravenous Bugblatter Beast proudly touching ham since, Tue 30 Nov 2004, 0:37, archived)

Of course
considering that satellites can get a resolution down to around 10m on other planets there are probly very few man-made structures that aren't visible from space.
(Cuddles It's not rape if they're already dead, Tue 30 Nov 2004, 1:37, archived)