1911 Gräf & Stift Bois de Boulogne, Archduke Franz Ferdinand of Austria - one such car is now shown at the Artstetten castle, which is now a Habsburg museum.
And I'd vote for a Jhle Dixi which I found at Hotel Westin in Frankfurt.
The connection: both cars are shown at a place which is not a car museum or a technical museum, but there are some cars (at Artstetten there are two Graf-Stift automobiles, while at the Hotel Westin you can see a dozen classic cars)