Thousands of pilgrims walked through the night to the Basilica of Our Lady of Lujan, one of Argentina's biggest Catholic gatherings.
Crowds queued at dawn to get in, and many held images of the Virgin Mary.
Inside, some people rested on the floor, and others had bandages wrapped around their feet after hours on the road.
Priests sprinkled holy water on the crowd and celebrated mass.
Many in the crowd also brought pictures of Pope Leo XIV, who plans to visit the country in November 2026. For some, that made this year's walk feel more important.
