Knock Shrine is a Roman Catholic pilgrimage site and National Shrine in the village of Knock, County Mayo, Ireland, where observers stated that there was an apparition of the Blessed Virgin Mary, Saint Joseph and Saint John the Evangelist in 1879. The Story of Knock began on the 21st August, 1879 when, at approximately 8 o’clock in the evening, fifteen people from the village of Knock in Co. Mayo, witnessed an Apparition of Our Lady, St. Joseph, St. John the Evangelist, a Lamb and cross on an altar at the gable wall of the Parish Church. The witnesses watched the Apparition in the pouring rain for two hours, reciting the Rosary. Although they themselves were saturated not a single drop of rain fell on the gable or vision. There were fifteen official witnesses to the Apparition, most of whom were from the village of Knock and surrounding areas and ranged in age from just 5 years old to 74 years old. Each of the witnesses gave testimonies to a Commission of Enquiry in October 1879. The findings of the Commission were that the testimonies were both trustworthy and satisfactory.
Though it remained for almost 100 years a major Irish pilgrimage site, Knock established itself as a world religious site in large measure during the last quarter of the twentieth century, largely due to the work of its longtime parish priest Monsignor James Horan. Horan presided over a major rebuilding of the site, with the provision of a new large Knock Basilica (the second in Ireland) alongside the old church. Horan secured from Irish Taoiseach Charles Haughey millions of pounds of state aid to build a major airport near Knock. The project was condemned by critics in the media. At the time the Irish economy was in depression with massive emigration. Contrary to the critics' expectation however - and with the advent of low-fare and discount airlines - Horan International Airport (now known as Ireland West Airport Knock) is a commercial success, drawing not just pilgrims as passengers, and has become the air-gateway for the whole of Connacht.