Reconstructed to support German revival:
Could you explain more which period you are referring to and what you had in mind to demonstrate/represent "support"?
Marbork was restored in stages between 1815 and start of WWII. The castle acquired a role as a symbol of Prussian history and national consciousness. It went on to be used by the Nazis for rallies/pilgrimages etc
Wartburg had a significant place in German mediaeval history and played a role in the development of German consciousness and unification up to 1848 and more symbolically thereafter. I understand it underwent restoration from 1838 onwards in Romantic/Gothic style.
So, I gather we are looking for buildings "restored" during the 19th century which played a role in developing/representing "German" consciousness/unity during the 19th century - particularly in the earlier part up to unification?
I have been looking in particular at the Castles/Fortresses of the Middle/Lower Rhine. A number of these underwent significant restoration during the 19th Century - in some cases from complete ruins (themselves often the result of the Napoleonic Wars). However the extent to which this was "to support German revival" I am not sure!!
Ehrenbreitstein Fortress was redeveloped by Prussia after it gained the Rhineland in 1815 having been dismantled by France in 1801. A massive statement of Prussian power which had moved down from the North. It certainly had symbolic value too and below it the spit of land known as "Deutches Eck " (harking back to its settlement by the Teutonic Knights) was used to build the enormous monument to Emperor William I who had led the reunification.
Does that "fit the bill"?