Amazingly this obvious companion print of the Castle-Hall-Garden-view print by Kornelie Gerland in before postings was send to me, obviously showing another spot in this unknown castle. I have a feeling it could be a Chateau or Grand House in or near Kornelie's native Strasbourg. Maybe with the help of readers we will be able to determine its location.
Some playful Googling (Chateau + escalier + Strasbourg) delivered this pretty similar (but not identical and mirrored) French castle staircase in Chateau de Pourtalès in Strasbourg. It was once the house and playground of the very rich bankers wife Melanie de Bussière, Comtesse de Pourtalès (1836-1914) in the 19th century where she entertained some very famous visitors: Franz Liszt, Kaiser Wilhelm-II, Albert Schweitzer (he was a local), Leon Bakst and many others. Today the Chateau is in use as a Hotel.
All pictures borrowed freely from the Internet for friendly, educational and non commercial use only