It's actually everywhere. Europe is full of door knobs. We're trying to make sure that everyone touches as many surfaces as possible. Next step would be tongue operated doors and switches.
Gemini: You've spotted a real historical and geographical divide. Door knobs are predominantly an Anglo-American standard, while lever handles dominate continental Europe, Scandinavia, and much of the rest of the world.
Jag vill ha runda "Door Knobs" till mina innerdörrar! Finns det att hitta i Sverige och fungerar det till våra kantiga dörrpryttlar (ja, du vet de där som ser till att dörren hålles stängd. Vad sjutton heter det??)?