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The archaeological area of Casalvieri is centered around the Sanctuary of Palsolo, which in the past was on the main road of trade and culture of southern Lazio, located in a strategic position, defended by the sighting center located on the hill of Vicalvi. The sanctuary in the pre-Roman Hellenistic age was an ’emporium’, ie a part of it was given in concession to foreign merchants to trade their wares.
The merchants had personal immunity and were free to carry on their business. A sort of modern ‘free zone’.
During the Roman period, the sanctuary was transformed into a thermal center fed by the sulphurous waters that naturally appear in the Pescarolo area.


Traveller's Guide to Italy