That strange light is caused by tree branches and leaf and street lights. There was a hidden place .. looks like burning or something. The shooting is a bit lighter than reality. It isn't edited.

I'm interesed in your 30 second expousure photos only if appears northern lights in .. I'm just curiously how it look. I can't shoot something because I'm not around. 30 seconds the stars often began to get blurry? ..hmm.. i don't know, you may not focalised it well or something .. is pretty hard to focalize in darkness .. but your also your argument such good.
I also use a k-30 Pentax ( forgot to say in first comment) and 18-135mm lenses. Yours what kind of lenses have?

Hello. I tried something alike to shoot in night with no flash with a tripod, exposure time 30 second, f4.0, iso 400( now i will deviate from the topic little) .. and nobody tells me before how.. it was such own find http://www.pentaxforums.com/gallery/images/62198/1_7.jpg

Well, I watching your photos and and I saw you used expousure time 20-25 seconds .. I'm curious why you didn't try with 30 seconds as time expousure ..it may looks interesting .. or you did and no photo here?

Anyway the place is great, and also the photographs