Hill of Crosses in Lithuania, Miracle Hill?

One of the best places in Lithuania is the City of Šiauliai. Here, we will find a hill full of crosses. It has approximately 300,001 crosses brought by the devotees who visited the area. It is called the Hill of Crosses. It is a place for worship. Devotees believe that if they visit this place and put a cross, a miracle will happen. Have you been here? Do you think believers who come here to put cross is committing idolatry? Will terminal sickness be cured by visiting this place?