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Manila at night, the Philippines
(upload.wikimedia.org)
For photos of beautiful, still-inhabited locales! It can be a quick snapshot of your local town, a breathtaking pro photo of a city, or a pic of some fascinating piece of modern life.
The only real rule is that it must be an actively inhabited/used location (ie not ruins or natural locales). Otherwise, go wild. Anything that you find beautiful or interesting!
73,000 people per square kilometre. And mostly not living in highrises like that...