From day to night

I took this photo when I was in south of Italy, some weeks ago.
I was at the daily market, taking some pictures, and went for a walk along the beach, to have a look at the fishing boats. Facing the sea there is a beautiful medieval castle, built by the Hohenstaufen during the 13th century. It’s surprisingly well preserved, and despite the fact that this has always been a land of battles and occupations, time has only scratched its walls.
Anyway, when I went home and looked at this photo I saw nothing.

Was about to bin it, but then at a second look I saw some potential. 
What if I change something?
What if it was taken at night? 
But I can’t go back at night.
Then what if I make it look like it was taken at night?
So I turned my laptop on, opened my notebook, grabbed my graphic tablet and started playing around: I darkened it, I added some blue, desaturated a bit, painted the lights, the flares, the rain. Different kinds of rain, ‘cause otherwise it would look too fake. A bit of fog here and there.
I had to stop myself after a while, ‘cause the possibilities were unlimited.
It doesn't look great, it was just a fun thing to do, I didn’t even put that much effort in making it look like a very realistic scene, but it opened a whole new world of opportunities: editing photos is an art itself, and your only limit is your imagination.