The pipes of Berlin.
Berlin is filled with pipes, so many, actually, that I thought they were a permanent fixture of the city. We (Hi, Melody !) spent most of our time trying to figure out what was going through the pipe. It turned out it’s water.
So we were working on the assumption that Berlin had an above ground water distribution system. Also, Berlin is filled with construction sites. We didn’t make the connection.
Thank god for the interwebs : it turns out that those pipes are there to get water away from the ground beneath construction sites and into the Canals or the river (source : here)
And they make awesome pictures ;)