The Shrine of Our Lady of Trsat is the largest pilgrimage centre of Western Croatia. Its foundation is reported to be, according to tradition, related to the miraculous transport of the Nazareth Barn, and its stay on Trsat (1291 – 1294). Shortly after the relocation of the Mother of God’s house to Loreto, Prince Nikola I of Krk built the first small church on the place where the barn stood on Trsat.
Marija`s Trsat became a pilgrimage point of convergence, the reputation of which was strengthened by the astounding painting of the Lady of Trsat, which was a gift given to the inconsolable Croats in 1367 by Pope Urban V for the loss of the Holy Barn. In the XV century, the Sanctuary was taken over by Franciscans, who have remained its guardians to the present day. On 8 June 2003, Pope John Paul II attended a long pilgrimage procession.
http://www.visitrijeka.eu/What_To_See/Attractions/Shrine_of_Our_Lady_of_Trsat