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In the latter half of the 19th century there was a cultural development in Europe and especially Germany called "Rheinromantik" (lit. rhine romanticism).
Stemming from the original meaning of romanticism, being the escape from the sad and grey reality of everyday life, this theme might fit greatly into this thread.
In Rheinromantik especially, the focus was on reliving the artistically rich past of the central european medieval ages, with many castle ruins being rebuilt after mostly original plans. Pic related is a painting from that age, currently residing in a museum in Cologne.