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So many great suggestions but wanted to say that Budapest is an absolutely gorgeous city.
The Jewish community is one of the oldest in Europe.
The Jewish museum is great to visit.
Poland is also quite beautiful.
Portugal is absolutely gorgeous, especially Lisbon or Porto.
I am from Switzerland so anywhere there is going to be pretty in the mountains part it might not be snowy just yet in December depending on the year but Villars or the surroundings might be a great place to go.
You can take the mountain scénique trains close from there the Bernina and others.
The view of the Dent du Midi is quite beautiful.