I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: Nosferatu Movie plot: Thomas Hutter lives in the (fictitious) German city of Wisborg. His employer, Knock, sends Hutter to Transylvania to visit a new client named Count Orlok. Hutter entrusts his loving wife Ellen to his good friend Harding and Harding's sister Annie, before embarking on his long journey. Nearing his destination in the Carpathian mountains, Hutter stops at an inn for dinner. The locals become frightened by the mere mention of Orlok's name and discourage him from traveling to his castle at night, warning of a werewolf on the prowl. The next morning, Hutter takes a coach to a high mountain pass, but the coachmen decline to take him any further than the bridge as nightfall is approaching. A black-swathed coach appears after Hutter crosses the bridge and the coachman gestures for him to climb aboard. Hutter is welcomed at a castle by Count Orlok. When Hutter is eating dinner and accidentally cuts his thumb, Orlok tries to suck the blood out, but his repulsed guest pulls his hand away. Hutter wakes up to a deserted castle the morning after and notices fresh punctures on his neck, which he attributes to mosquitoes in his letter to his wife which he hands over to a courier on horseback to be delivered to his devoted wife. That night, Orlok signs the documents to purchase the house across from Hutter's own home and notices a photo of Hutter's wife remarking that she has a lovely neck. Reading a book about vampires that he took from the local inn, Hutter starts to suspect that Orlok is Nosferatu, the "Bird of Death." He cowers in his room as midnight approaches, but there is no way to bar the door. The door opens by itself and Orlok enters, his true nature finally revealed, and Hutter hides under the bedcovers and falls unconscious. At the same time this is happening, the wife awakens from her sleep and in a trance walks towards the balcony and onto the railing. Alarmed, Harding shouts Ellen's name and she faints while he asks for a doctor. After the doctor arrives, she shouts Hutter's name remaining in the trance and... My question: Where is Orlok's ruined castle located?
A:
In the Carpathian Mountains.