Humanity's grandest architectural triumph isn't some single building or monument. It's the cities that surround them, the forests of high-rises that house more than half the human population within their limits. Cities grow almost organically to suit the needs of their residents, resulting in a cityscape as unique as the people that lives there. Can you identify these international metropoli based only on their shapes?
Name your picks in the discussion below and we'll publish the correct answers later today!