The photo challenge asks for buildings and trees. The first two pictures are maybe not quite was is expected, yet …
A house side panel in Weimar, Germany.
Literally, a house with a tree, Haus zum Dannenbaum (House of the Fir Tree) in Ladenburg, Germany.
And then something more traditional:
The entry building to the German national garden show in Brandenburg an der Havel.
Hermannshof, a show garden with the original house in Weinheim, Germany.