On the occasion of the centenary of the apparitions of Fatima (1917-2017), the International Congress on Religious Tourism and Pilgrimage will be organized jointly by the World Tourism Organization (UNWTO), the Ministry of Economy of Portugal and the Municipality of Ourém. The Congress will reflect on the potential and the role of religious tourism and sacred places as a tool for socio-economic and cultural development of destinations. Knowing the motivations that lead millions of peoples to travel to sacred places is an essential condition for the sustainable development of destinations.