Just my humble two cents, after a quick review:
* Fast and easy navigation, thanks!
* Most texts in English, but there are others in German.
* I would change the URLs from "page_id" to something more meaningful.
* The banner to "seen.by" looks like an ad to me, and gives an image of "cheap site".
* You have several panoramas, but all of them from the same bridge; that looks "unpolished" to me.
* The "Galleries" menu takes a bit to roll down; by the time I noticed it was rolling down, I had already pressed it.
* I would remove the "Privat" link; it only serves you.
* And I would also remove the "Blog" link, until you have some real content there.
Hope this helps.