The patroness of Lugnano in Teverina is Our Lady of the Assumption, celebrated on 15 August. The collegiate church dedicated to her was built between the 11th and 12th centuries over an earlier 9th-century structure, with a portico added before 1230, in Romanesque style: inside it holds fine Cosmatesque mosaics, a Crucifixion of the Giottesque school, and the painting of the Beheaded Saint John by the Forlì-school painter Livio Agresti. In the 16th century the entire population of Lugnano gathered within it.
Among the town's other religious buildings stands the Convent of San Francesco, dating from the early 13th century, built by the people of Lugnano in 1229 on the spot where, according to tradition, Saint Francis performed the miracle of saving a child from a wolf's jaws with the help of a goose; it holds frescoed rooms and an evocative cloister. Within the municipal territory also stands the Roman villa of Poggio Gramignano, with its attached children's necropolis, today home to an archaeological museum.
