Brilliant place, stocked full of interesting stories from the annals of Italian crime, implements of torture and all sorts of detail.
Some of the things are a bit gruesome and sad, but it's all part of the history in any country.
I learnt a lot here and would definitely visit again.
It's free, but well worth donating some change to keep it going as it's well presented and simple to follow.
We went after a visit to the Vatican, as it's a short walk over the Tiber and slightly south.
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