San Sisto is a Romanesque-style Roman Catholic church in the town of Viterbo in the Region of Lazio. The church was once known as San Sisto fuori la Porta Romana.
Wikipedia https://en.wikipedia.org/wiki/San_Sisto,_Viterbo
Address 61 Via Giuseppe Garibaldi, Viterbo 01100, Italy
Coordinates 42°24'53.22" N 12°6'35.534" E