Norwegian Airlines posters ad campaign

I saw these posters when I was in the Stockholm metro. I did a double take, wondering why London events were being advertised to the Swedes.

Then, I noticed more posters - from Krakow, Riga and Berlin, and realised it was an ace ad campaign from Norwegian Airlines. Here's a little video about how it was made.

It's not only a great campaign, but I really love how the sense of the cities come through in the posters.