The Franciscan church and monastery in the centre of town house the most venerated icon in Dalmatia: a 16th-century painting of the Madonna and Child known as Gospa Sinjska, Our Lady of Sinj. Pilgrims come year-round, but the great pilgrimage is on 15 August, the Feast of the Assumption, when the icon is carried in procession through the streets.
The church itself was rebuilt several times — most recently after Allied bombing in 1944 — but the cloister has older fabric. The crown on the icon is real gold, donated by the Pope in 1716 as thanks for the city's survival of the Ottoman siege.