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Uncle Matt at the "Gorg outpost" in Bavaria.
Neuschwanstein Castle is a popular tourist attraction in Germany, with a history as the palace of King Ludwig II of Bavaria. It served as the inspiration for Sleeping Beauty Castle at Disneyland.
Uncle Traveling Matt visits the castle in the Fraggle Rock episode "The Great Radish Caper," assuming from its size that it must be a Gorg outpost. Since where Gorgs live, radishes must be nearby, Uncle Matt succeeds in finding the vegetable at a nearby stall.
The castle can also briefly be spotted in the Muppet Babies episode "Gonzo's Video Show," as Skeeter's (imagined) sand castle.
Neuschwanstein as Skeeter's sand castle in "Gonzo's Video Show"