Charles of Lorraine, who governed the Austrian Netherlands in the 18th century, filled this 1757 building with ornate stonework, beautiful floor art, and other delights. Now used as the Museum of the 18th Century and the Royal Belgian library, it is dominated by a vast staircase leading to a rotunda that is paved with 28 types of Belgian marble, a small sample of Charles's collection of minerals. You can look around the five lavish rooms where the prince entertained guests and see decorative and scientific objects of the time.
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