3Windsor Castle – England (circa 1070 AD)

Windsor Castle holds the distinction of being the oldest and largest occupied castle in the world. Originally built by William the Conqueror in the 11th century, it has served as a royal residence for over 950 years.

The castle has been expanded and remodeled by successive monarchs and is still used by the British royal family today. From its grand halls to its fortified towers, Windsor is both a historical monument and a living piece of heritage.

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