Prince Theodore's castle

Prince Theodore's Castle is a location somewhere near the Smurf Forest and is the personal residency of Prince Theodore and his subjects.

Mainstream Smurfs Media
First introduced in "The Prince and the Hopper" of the cartoon show, this castle is featured with a large body of water directly corrosponding to the front gates, a wide perimeter, and is decorated for what would have been his wedding with Lady Jasmine. Later in "Gargamel's New Job," it is featured from atop (or on the other side of) a hill with a narrower, taller perimeter.