In 1985 John Paul II wrote an Apostolic Letter to the young throughout the world and on 20 December announced that he was establishing World Youth Day.
Countries that have hosted the WYD in the past:
1986: Italy
1987: Argentina
1989: Spain
1991: Poland
1993: United States
1995: Philippines
1997: France
2000: Italy
2002: Canada
2005: Germany
2008: Australia
2011: Spain
2013: Brazil
2016: Poland
2019: Panama