Maybe they got someone /exactly/ like you in to do just that. You said you'd worked there, maybe them Frenchies did a bit of design outsourcing.
So, how long was that bit o' string to reach the Arc de Triomphe? Must be a good mile or two?
Ladefense.
Literally roughed out the outline only so far. Quite a bit of terrain needs getting rid of and flattening out.