René M.
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Wonderful Rococo gem near Kassel, considered the second most elegant Rococo summer palace in Germany after the Sanssouci in Potsdam. I was glad it was open in November (though we could only visit the main building and the gardens). Every major room we saw was magnificently decorated... even some of the concealed passageways and rooms for children or butler/ladies in waiting were pretty.
Tickets were very affordable and included a guided tour (in German... well, I visited with a German friend and understood most of the explanation, so didn't ask about the possibility of an English tour or translation...). The guide was extremely knowledgeable, yet humble and honest enough to answer a visitor who was especially interested in a specific furnishing: "I don't know the cabinet maker or manufactury that built that particular piece of furniture or decoration, but will inquire for you or check the inventory if you wish". I find that kind of attitude wonderful.