Pilgrims shield themselves from a scorching sun at Parque Tejo in Lisbon where Pope Francis is presiding over a mass celebrating the 37th World Youth Day, Sunday, Aug. 6, 2023. An estimated 1.5 million young people filled the parque on Saturday for Pope Francis' World Youth Day vigil, braving scorching heat to secure a spot for the evening prayer and to camp out overnight for his final farewell Mass on Sunday morning. (AP Photo/Ana Brigida)