The Papal Cross at the edge of Fifteen Acres was erected as a backdrop for the outdoor mass celebrated there by Pope John Paul II on 29 September 1979, the first day of his pastoral visit to Ireland. The congregation numbered over one million, equal to Dublin's population. The white Latin cross, which dominates its surroundings, is 35 metres (115 ft) high and was built with steel girders. It was installed with some difficulty: after several attempts, the cross was eventually erected just a fortnight before the Pope arrived. When John Paul died in 2005, devotees gathered at the Papal Cross, praying and leaving flowers and other tokens of remembrance. Pope Francis celebrated mass here on the final day of his 2018 visit to Ireland.