…a city built largely of concrete tower blocks.
Then … Tehran?
(Paris will do in a pinch.)
On this same general theme–
Orbital Goat Cannons (listed for the newbies)
http://boards.straightdope.com/sdmb/showthread.php?t=41020&highlight=goat+cannon
Incendiary Pigs–
http://boards.straightdope.com/sdmb/showthread.php?t=279280&highlight=goat+cannon
Surely it would have been easier and cheaper to just get a tugboat to pull it out to sea, and sink it? 
Heh, the orbital goat cannon reminds me of a whimsical scientific D&D thread… I don’t remember where exactly. Either on the Order of the Stick forum or the Wizards of the Coast one.
The basic idea was that, since passing an item to another character is a free (hence, instantaneous) action, a long line of peasants passing a pig along constituted a rail gun, as the pig was accelerated to insane speeds over a single round (i.e. 10 seconds). The math was solid, too. As the thread grew on, they found the precise pig-line length to achieve planet busting power as per impact damage rules.
That’s not the good old boy way of doing things.
How about a giant permanent aircraft carrier? Project Habakkuk - Wikipedia
Gotta love Wikipedia, where a relatively obscure Simpsons character gets just about as much ink (er, electrons) as historic European royalty: List of recurring The Simpsons characters - Wikipedia
Sophia of Nassau - Wikipedia