Bow your head, say a prayer and perhaps even light a candle in Cattedrale di San Lorenzo. This important religious building may not always be accessible, so check ahead for times if you'd like to see inside.
You'll soon learn why this Viterbo principal church is visited by many travelers. If you're looking for more to explore, Spa of the Popes, Viterbo Cathedral, and Bagnaccio Hot Springs are in this area as well. They won't take very long to reach from Cattedrale di San Lorenzo.