At this year's WHC meeting, the borders of several older WHS were clarified for the first time. See URL
Someone has gone bravely through them, and suggested a number of corrections to existing connections.
For Budapest: The Great Synagogue, the Eiffel Railway Station, St. Stephen's Cathedral are definitely outside the core zone of the WHS. The Gül Baba Tomb is doubtful too, but I let it stay on for the moment (any other sources than the map mentioned in the link above?).
For Dresden: the Altmarkt is outside