If you've spent most of your life in or near a big city, chances are that your idea of the night sky tends to be dark and gloomy. If, however, you've spent any time in a more rural part of the world, you know that in fact, the night sky can be bright and incredibly beautiful, full of these things called stars. If you've forgotten what they look like, you can thank light pollution, which has rendered cities like New York utterly dark after 7 pm, save for the streetlamps.
To show you what your city could look like without pollution, photographer Thierry Cohen has put together Darkened Cities, a collection of cities with their would-be skies. Cohen shoots clear night skies in places like Montana and the Sahara and matches them with a city on the same latitude, rendering the piece of sky that would be visible under optimal conditions.