One of the joys of overnight bushwalks is seeing the night sky without light pollution – I always enjoy lying back on my therm-a-rest and looking up at the stars.

French photographer Thierry Cohen wondered what the sky would look like in major cities without the light pollution (and smog). He set about creating some images by combining photographs of the cities with photographs of the night sky taken at the same latitudes but in remote areas.

The results are superb.