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Gravensteen Castle - 6-12 Sint-Widostraat, Ghent, Belgium

This might look like a fairytale castle, but it has a horrible history. Around the 14th century, it was nearly torn down, due to its history of torture and injustice. It was subsequently a courthouse and prison. Beautifully restored, the castle makes a very worthwhile visit, where visitors can even see a torture museum.