City: Będzin,
Region: Dabrova Basin (Zagłębie Dąbrowskie)
Province: Silesian (województwo śląskie)
Poland

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The stone castle dates to the 14th century, and is predated by a wooden fortification that was erected in the 11th century. It was an important fortification in the Kingdom of Poland and later, the Polish–Lithuanian Commonwealth.

More info (in English): https://en.wikipedia.org/wiki/B%C4%99dzin_Castle
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The construction is not finished yet. There is still a lot to do: interior finishing, castle equipment, external walls, etc.. If you have any ideas, please write in the comment.