Viterbo boasts of an underground river that is filled with “hypothermal waters” like few others in Italy.Few towns in Italy can compare to Viterbo’s historical and archaeological past.Located near Rome-Caput Mundi, Viterbo’s modern spas make available every kind of treatment which brings out the therapeutic effect of its golden river.Nobody will be amazed, therefore, at the great success these spas already had during the Age of the Etruscans.The hypothermal waters are between 40° and 56° C and contain mostly sulphureous-sulphate-bicarbonate-alkaline earthy substances.