Update:
ATTENTION: The map looks emptier than my last one but that's because I took out

and

.. they should not count cause I didnt stay there but only travelled through
I wasnt sure if I should count

.. I spent a night at Malmö central station and spotted a poster of the Space Lady ( [MENTION=9441]RainyWoods[/MENTION] remembers ) .. I took a walk to the market place or something.. so I sort of "visited" the city

Oslo (2017)
London (2013)

Gibraltar (2017)

Groningen (a couple of times, ask my parents why we never went to visit the interesting cities)
Bremen (home town)
I spend much time in Hamburg. Then, I've visited Cologne quite often...ofc I've been also to Berlin, Munich, Düsseldorf, Hannover...Northern Sea, Baltic Sea, Alps.. Now, I won't start naming villages nobody knows such as Delmenhorst
Still missing: Frankfurt and Stuttgart. Dresden too, sadly. I still need to visit Neuschwanstein. I desperately wanna see it

Interlaken (a city close to Bern I think. It was in 2003 & 2004)
Some skiing area on the tri-border-area of Austria, Italy, Slovenia (2013)
Vienna (next week)
Tuscany (7-8 times)
Rome (2014)
Vatican City (2014, when I was in Rome)
Andalucia (2017)
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Plans for 2018:

- I'm gonna couch-surf there, so it won't cost me too much

- maybe Paris? Then again, it's the city of love and I am doomed to be alone forever. So maybe not the right city for me