Here's another couple of connections that I plan to reject, if nobody will oppose with strong arguments!
LAKES: Kizhi and Lavaux >> these sites are located at the shores of a lake, but the lake itself isn't part of the WHS. I feel if we would allow these, we draw many more border cases in at other connections.
SHOPPING ARCADES: Paris - Rue de Rivoli, Vienna - Freyungspassage, St Petersburg - The Passage >> every city has a shopping arcade in some form, difficult to draw any borders here as what is 'notable'
HISTORICAL CAFES: Vienna (Central, Demel, Sacher, Landtmann, Hawelka), Prag (Kafka), Budapest (Gerbeaud, Ruszwurm) Rome (Greco), Salzburg (Tomaselli), Paris (de la Paix) >> same story as with the shopping arcades
COLOURS: White City, White Monuments, Red Square, Greater Blue Mountains >> a bit too obvious to my taste