I flew through the night to Singapore once. I remember two very striking light sources.

Firstly, oil well flares in the Middle East. The oil fields are in the middle of nowhere, so they're these huge orange-red blooms set in utter darkness.

Secondly, Delhi. The city is brightly lit with streetlights. But there's a suburb (?) to the south, Faridabad, that's as brightly lit, but with a different, whiter, kind of lights. So you had these two huge blotches of yellow and blue light projecting into each other. There are also some extremely bright areas to the south of the city - after some investigation, I decided they were probably rock-crushing plants.