The border between India and Pakistan is one of the heavily guarded and lit stretch in the world, so much that it can be seen from space at night. It covers an immense distance from the Arabian Sea to the Himalayan foothills.

Here is how it looks from ISS. [India-Pakistan Border at Night from NASA Earth Observatory][1]

> The winding border between Pakistan and India is lit by security lights that have a distinct orange tone. The port city of Karachi is the bright cluster of lights facing the Arabian Sea. For scale, the distance from Karachi to the foothills of the Himalaya Mountains is 1,160 kilometers (720 miles)

[![Indo-Pak Border][2]][2]

Another interesting historical divide that can be seen even today is the effect of the Berlin wall. Despite the reunification, the remnants can be still seen today. [Berlin at Night by ESA astronaut André Kuipers][3]. A zoomed-in version of the original image from the Washington Post is shown below. 

> The former division between East and West Berlin can be seen. The yellow
lights correspond to East Berlin and the greener tones show West Berlin. *The difference in colour is due to yellow/orange sodium lamps in erstwhile East Berlin and white-green mercury lamps in West Berlin*

Thanks to @winny to point the reason for the difference in the hues.

[![Berlin at night][4]][4]


  [1]: https://earthobservatory.nasa.gov/images/86725/india-pakistan-border-at-night
  [2]: https://eoimages.gsfc.nasa.gov/images/imagerecords/86000/86725/iss045e027869.jpg
  [3]: http://www.esa.int/spaceinimages/Images/2012/05/Berlin_at_night
  [4]: https://i.sstatic.net/mXbyF.jpg