A fellow user from the lost-places-board that I am a moderator in, came up with this
little gem. It is a residential, mansion-like house in a little village in northern Germany.
I couldn't find anything about the history of the house.
From the looks of it, it was built sometime between 1850 and 1900. The newest newspapers and correnspondence that I found inside dated back to 2005. The village used to be home to a family of master builders from the late 1600s until the 1800s. Who knows, maybe the house we visited was built by them...