The Witcher filmed at Tata Castle, Tata. A lakeside castle from the fourteenth century is used as the house where the sorceress is shown in a trance. On screen it's Yennefer's house.
Probable Named in published production coverage; the coordinate is the place itself, checked against a gazetteer.
Venture keeps every scene location on one map, sorted by how far you'd have to walk. Open it in Tata and it tells you what was shot around you, how to get there, and whether you can actually go in.
Download Venture for iOS Android