My first nominee would be Athens, I would never want to see this city become highrise or lowrise sprawled (currently a sea of 6 storey buildings).
Infamous for its concrete junglism I think now, especially after the Olympic makeover, the place is beautiful and should be kept as it is, its unique:
This 1st pic is an old photo, its all cleaned and white now, but it shows the amazing density (thanx to Giorgio @ skyscrapercity for the pics):
Before the makeover, and after the Walled City in HK was razed parts of Athens, such as Kypseli, became the most crowded place on earth.
www.airphotos.gr
thanx to potiz81 @ skyscrapercity for these:
www.airphotos.gr
Lykavittos Hill and the view from the top:
www.athensguide.com
Athenian cats can CLIMB up to 12 storeys from balcony to balcony
greeklandscapes.com
www.mccullagh.org
Giorgio @ skyscrapercity
the density from satellite view, the city is basically trapped in one huge basin and hemmed in by the mountains. In the NW it's 'broken through' a gap and started to suburbanise toward the coastal strip of towns. The official population is 3.5 million, the unofficial 5 million.
www.masciarellidesign.com
Even the suburbs are relatively dense and highrise
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