To spend a pleasant day in Fabrica di Roma, one can begin by walking through the old town, concentrating on the area called La Rocca: the path starts from Piazza Duomo (the centre of the town) and runs through the middle of streets and lanes through which you can read the story of Fabrica di Roma, with the crests and the holy icons still imprinted on the old buildings and houses carved in gray tuff typical of Viterbo. The Urban Trekking path, which these long walks through the city are now called, proceeds to Via della Fontanella, then Piazza Marconi, Piazzetta della Cella (where the earliest houses of local antiquity had been constructed) until you return to Piazza Duomo and there rest a moment and then travel by car or by bus to the archaeological site of Falerii and visit the Gate of Jupiter and the Church of Santa Maria in Falerii (12th century), though perhaps this new tourist route is better to do the next day, if you'd like a more relaxed visit.
Villa Farnese or Villa Caprarola
A grand Renaissance villa in Caprarola. A garden with Casino Del Piacere is behind the villa.