I've recently been on Rügen and I have seen this:
Does anybody have an idea what this is?
(To give Google a chance: A ship with four "towers" made out of steel on it. They looks a bit like high-voltage electrical towers.)
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It's a heavy-lift vessel, carrying four identical structures as cargo.
It's very likely they are jacket foundations for offshore wind turbines. The excellent 4C Offshore has a database of such vessels used on offshore wind farms. It also has a list of all offshore windfarms under construction by country, and tells you which vessels are working on it, so given that you know where the photo was taken, you may able to work out which farm it's supplying.