The baronial Spinelli palace of Esperia was built in 1470 when Roccaguglielma was ruled by the powerful family of Spinelli.
Over the years it was used as a prison, the trial court and the tobacco factory.
Now a municipal property managed by the Natural Park of Aurunci Mountains.
It is home to the museum of Karst, a youth hostel with rooms and restaurant, a conference room and workshops.
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