Santa Maria della Verità is a 13th-century church and former Augustinian monastery on the eastern edge of the historic centre, now home to the Museo Civico di Viterbo. The church itself is worth visiting for a single overwhelming reason: the frescoed cloister by Lorenzo da Viterbo, painted around 1469. It is one of the finest Renaissance fresco cycles in Lazio outside Rome, strongly influenced by Piero della Francesca with whom Lorenzo had studied.
The Museo Civico in the monastic buildings holds archaeological material from the surrounding territory — Etruscan and Roman finds, medieval sculpture, and a Pietà attributed to Sebastiano del Piombo. But the cloister is the real draw: intimate in scale, beautifully coloured, and largely unknown to international visitors.
The walk from the centre takes about ten minutes through the eastern part of the old town, passing several minor churches and the remains of the city walls.