Hallo mein Kollege anons!
Das ist so weit wie mein Deutsch geht.
I was doing a search on "Door of All Doors" when I saw a link to "kollreider.eu." It didn't work, but an image search revealed many unsettling images (pics related).
Many of the images came from this website–you will see some of them immediately, and find more in the archives.
http://www.gemeinde-strassen.at/
I don't speak German, but perhaps this link will be of interest to you.