In 2011, Luis Martinez, 29, traveled to Madrid, almost by accident. He said it was destiny that took him from his home in Fresnillo, Mexico, as a pilgrim to World Youth Day. Someone could not go at the last minute, and he ended up taking the spot.
James Kelliher, 27, was also there, visiting from London. He said his country can be "aggressively secular," something that challenges him to think about what he believes and ultimately landed him in Madrid among millions of young Catholics from all over the world.