The Sanctuary of Monte San Michele is said to be the most important place of worship for the whole Christian world. It is well known to be the destination for millions of pilgrims who know it as the ‘door to the sky’. The sanctuary is unique as it completely built inside a natural cave where it is said the Archangel appeared several times to the Bishop, who had the church built here. Adjoining the sanctuary is the pilgrim’s house; it’s a lodge open to individual visitors and to groups in the spring and summer.