This is Vianden, Luxembourg. I have come close to it but never made it here, perhaps too much driving around. This time I came straight from Echternach on the road N10 and it was fantastic, one of the highlights of the trip as we love castles.
There is a quaint small town ambiance which is superb here, we love it, and nice churches such as St Nicolas and Des Trinitaires; as well as a good cable car that takes you the castle about 15 minutes walking from it for 4,80€ roundtrip. And the river Our with its cascades and levies is nice natural environment to see and walk its banks.
However, all else is secondary to the Castle of Vianden. http://www.castle-vianden.lu/english/visit/index.html
It is open every day from 10h and until 16h to 18h depending the date. admission is 6€ adults.
You come up a long winding hilly road into the entrance gates, pay, and go up more steps into the first courtyard. YOu follow a sequence of numbered rooms to the Arms hall, archeological crypt, early kitchen, lower chapel (with byzantines designs) ,knight’s study, inner courtyard, upper chapel, Byzantine gallery, JP Kotz hall, Charles Arendt hall, Banqueting hall, bedroom, festivity hall, genealogy hall, grand kitchen, dining hall, the well, knight’s hall, and the large cellars. You can easily spend half day looking at the castle alone or more.
More info in Vianden tourist office here, http://www.vianden-info.lu/francais/visites-et-decouvertes/patrimoine-historique/le-chteau-de-vianden
The castle is impressive , with great showing , and a nice cafeteria at the way out , suggest though to get something to drink as you start your tour, bottle of water etc as the long up and down sideways can be exhaustive for older and or less active folks.
In all, with only a couple places to see and maybe eat here or take picnic food as we did, you can have a wonderful time in Vianden. We love it, and will be back. Enjoy your Sunday, I am catching up on my trip lol!